I'm working on modernizing Rosetta Code's infrastructure. Starting with communications. Please accept this time-limited open invite to RC's Slack.. --Michael Mol (talk) 20:59, 30 May 2020 (UTC)

# Substitution cipher

Substitution cipher
You are encouraged to solve this task according to the task description, using any language you may know.

Substitution Cipher Implementation - File Encryption/Decryption

Encrypt a input/source file by replacing every upper/lower case alphabets of the source file with another predetermined upper/lower case alphabets or symbols and save it into another output/encrypted file and then again convert that output/encrypted file into original/decrypted file.

This type of Encryption/Decryption scheme is often called a Substitution Cipher.

## 11l

Translation of: Kotlin
`V key = ‘]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\C1yxJ’ F encode(s)   V r = ‘’   L(c) s      r ‘’= :key[c.code - 32]   R r F decode(s)   V r = ‘’   L(c) s      r ‘’= Char(code' :key.index(c) + 32)   R r V s = ‘The quick brown fox jumps over the lazy dog, who barks VERY loudly!’V enc = encode(s)print(‘Encoded:  ’enc)print(‘Decoded:  ’decode(enc))`
Output:
```Encoded:  2bu]E,KHm].Tdc|]4d\]),8M>]dQuT]<bu]U31C]Idf_]cbd].3Tm>]+ZzL]Ud,IUCk
Decoded:  The quick brown fox jumps over the lazy dog, who barks VERY loudly!
```

` with Ada.Command_Line; use Ada.Command_Line;with Ada.Sequential_IO;with Ada.Strings.Maps; use Ada.Strings.Maps;with Ada.Text_IO; procedure Cipher is   package Char_IO is new Ada.Sequential_IO (Character);   use Char_IO;   Alphabet: constant String := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";   Key :     constant String := "VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN";   My_Map : Character_Mapping;   Input, Output : File_Type;   Buffer        : Character;begin   declare      use Ada.Text_IO;   begin      if Argument_Count /= 1 then	 Put_Line("Usage: " & Command_Name & " <encode|decode>");      else	 if Argument(1) = "encode" then	    My_Map := To_Mapping(From => Alphabet, To => Key);	 elsif Argument(1) = "decode" then	    My_Map := To_Mapping(From => Key, To => Alphabet);	 else	    Put_Line("Unrecognised Argument: " & Argument(1));	    return;	 end if;      end if;   end;   Open       (File => Input,  Mode => In_File,  Name => "input.txt");   Create     (File => Output, Mode => Out_File, Name => "output.txt");   loop      Read  (File => Input,  Item => Buffer);      Buffer := Value(Map => My_Map, Element => Buffer);      Write (File => Output, Item => Buffer);   end loop;exception   when Char_IO.End_Error =>      if Is_Open(Input) then         Close (Input);      end if;      if Is_Open(Output) then         Close (Output);      end if;end Cipher; `

## Arturo

`key: {:]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\C1yxJ:} encode: function [str][    bs: new []    loop split str 'ch ->        'bs ++ to :string key\[(to :integer to :char ch)-32]    return join bs] decode: function [str][    bs: new []    loop split str 'ch ->        'bs ++ to :string to :char (index key ch)+32    return join bs] s: "The quick brown fox jumps over the lazy dog, who barks VERY loudly!" enc: encode sprint ["encoded:" enc]print ["decoded:" decode enc]`
Output:
```encoded: 2bu]E,KHm].Tdc|]4d\]),8M>]dQuT]<bu]U31C]Idf_]cbd].3Tm>]+ZzL]Ud,IUCk
decoded: The quick brown fox jumps over the lazy dog, who barks VERY loudly!```

## C

Takes input file name, plain and cipher keys and the action ( Encrypt or Decrypt) as inputs. Only the first character of the action string is checked, so if you are feeling really NSA like, use whatever string you want as long as it has a d/D or e/E in front.

` #include<stdlib.h>#include<stdio.h>#include<wchar.h> #define ENCRYPT 0#define DECRYPT 1#define ALPHA 33#define OMEGA 126 int wideStrLen(wchar_t* str){	int i = 0;	while(str[i++]!=00); 	return i;} void processFile(char* fileName,char plainKey, char cipherKey,int flag){ 	FILE* inpFile = fopen(fileName,"r");	FILE* outFile; 	int i,len, diff = (flag==ENCRYPT)?(int)cipherKey - (int)plainKey:(int)plainKey - (int)cipherKey;	wchar_t str[1000], *outStr;	char* outFileName = (char*)malloc((strlen(fileName)+5)*sizeof(char)); 	sprintf(outFileName,"%s_%s",fileName,(flag==ENCRYPT)?"ENC":"DEC"); 	outFile = fopen(outFileName,"w"); 	while(fgetws(str,1000,inpFile)!=NULL){		len = wideStrLen(str); 		outStr = (wchar_t*)malloc((len + 1)*sizeof(wchar_t)); 		for(i=0;i<len;i++){			if((int)str[i]>=ALPHA && (int)str[i]<=OMEGA && flag == ENCRYPT)				outStr[i] = (wchar_t)((int)str[i]+diff);			 else if((int)str[i]-diff>=ALPHA && (int)str[i]-diff<=OMEGA && flag == DECRYPT)				outStr[i] = (wchar_t)((int)str[i]-diff);			else				outStr[i] = str[i];		}		outStr[i]=str[i]; 		fputws(outStr,outFile); 		free(outStr);	} 	fclose(inpFile);	fclose(outFile);} int main(int argC,char* argV[]){	if(argC!=5)		printf("Usage : %s <file name, plain key, cipher key, action (E)ncrypt or (D)ecrypt>",argV[0]);	else{		processFile(argV[1],argV[2][0],argV[3][0],(argV[4][0]=='E'||argV[4][0]=='e')?ENCRYPT:DECRYPT); 		printf("File %s_%s has been written to the same location as input file.",argV[1],(argV[4][0]=='E'||argV[4][0]=='e')?"ENC":"DEC");	} 	return 0;} `

A long, long time ago ( yes, I have said it before ), I read Digital Fortress by Dan Brown. One thing which struck me was Ensei Tankado using the same algorithm to encrypt itself ( or it's human readable Unicode version, if you are a purist). I remembered the name : Bigelman's Safe, but I got the spelling wrong so I had to read the copy on archive.org, it's there on the last line of page 30/31, Biggleman's Safe.

So here it is, a program which encrypts itself, you saw the cleartext file above, now here's the invocation and ciphertext file.

```C:\rosettaCode>biggleman.exe substitutionCipher.c a e E
File substitutionCipher.c_ENC has been written to the same location as input file.
```

And here's what substitutionCipher.c_ENC looks like :

```3.Eflmwlio Klswl0 55xl Sgxsfiv 645;.3

'[email protected]
'[email protected]
'[email protected]{glev2lB

'hijmri IRGV]TX 4
'hijmri HIGV]TX 5
'hijmri EPTLE 77
'hijmri SQIKE 56:

mrx {mhiWxvPir,{glevcx. wxv-�
mrx m A 4?
{lmpi,wxv_m//a%A44-?

vixyvr m?
�

zsmh tvsgiwwJmpi,glev. jmpiReqi0glev tpemrOi}0 glev gmtlivOi}0mrx jpek-�

JMPI. mrtJmpi A jstir,jmpiReqi0&v&-?
JMPI. syxJmpi?

mrx m0pir0 hmjj A ,jpekAAIRGV]TX-C,mrx-gmtlivOi} 1 ,mrx-tpemrOi}>,mrx-tpemrOi} 1 ,mrx-gmtlivOi}?
{glevcx wxv_5444a0 .syxWxv?
glev. syxJmpiReqi A ,glev.-qeppsg,,wxvpir,jmpiReqi-/9-.wm~isj,glev--?

wtvmrxj,syxJmpiReqi0&)wc)w&0jmpiReqi0,jpekAAIRGV]TX-C&IRG&>&HIG&-?

syxJmpi A jstir,syxJmpiReqi0&{&-?

{lmpi,jkix{w,wxv054440mrtJmpi-%ARYPP-�
pir A {mhiWxvPir,wxv-?

syxWxv A ,{glevcx.-qeppsg,,pir / 5-.wm~isj,{glevcx--?

jsv,[email protected]?m//-�
mj,,mrx-wxv_maBAEPTLE ** ,[email protected] ** jpek AA IRGV]TX-
syxWxv_ma A ,{glevcx-,,mrx-wxv_ma/hmjj-?
ipwi mj,,mrx-wxv_ma1hmjjBAEPTLE ** ,[email protected] ** jpek AA HIGV]TX-
syxWxv_ma A ,{glevcx-,,mrx-wxv_ma1hmjj-?
ipwi
syxWxv_ma A wxv_ma?
�
syxWxv_maAwxv_ma?

jtyx{w,syxWxv0syxJmpi-?

jvii,syxWxv-?
�

jgpswi,mrtJmpi-?
jgpswi,syxJmpi-?
�

mrx qemr,mrx evkG0glev. evkZ_a-�
mj,evkG%A9-
tvmrxj,&Yweki > )w @jmpi reqi0 tpemr oi}0 gmtliv oi}0 egxmsr ,I-rgv}tx sv ,H-igv}txB&0evkZ_4a-?
ipwi�
tvsgiwwJmpi,evkZ_5a0evkZ_6a_4a0evkZ_7a_4a0,evkZ_8a_4aAA+I+€€evkZ_8a_4aAA+i+-CIRGV]TX>HIGV]TX-?

tvmrxj,&Jmpi )wc)w lew fiir {vmxxir xs xli weqi psgexmsr ew mrtyx jmpi2&0evkZ_5a0,evkZ_8a_4aAA+I+€€evkZ_8a_4aAA+i+-C&IRG&>&HIG&-?
�

vixyvr 4?
�
```

And to decrypt :

```C:\rosettaCode>biggleman.exe substitutionCipher.c_ENC e a D
File substitutionCipher.c_ENC_DEC has been written to the same location as input file.
```

And for the cleartext, just scroll up...btw, did you know that Digital Fortress was Brown's first novel and he wrote it back in 1998 ? Wonder why nobody ever saw Snowden happening ?

## C#

`using System;using System.IO;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks; namespace SubstitutionCipherProject{    class SubstitutionCipher    {        static void Main(string[] args)        {            doEncDec("e:\\source.txt", "enc.txt", true);            doEncDec("enc.txt", "dec.txt", false);            Console.WriteLine("Done");            Console.ReadKey();        }        static void doEncDec(String source, String target, bool IsEncrypt)        {            ITransform trans;             if (IsEncrypt)                trans = new Encrypt();            else                trans = new Decrypt();             FileInfo sfi = new FileInfo(source);            FileStream sstream = sfi.OpenRead();            StreamReader sr = new StreamReader(sstream);             FileInfo tfi = new FileInfo(target);            FileStream tstream = tfi.OpenWrite();            TransformWriter tw = new TransformWriter(tstream, trans);            StreamWriter sw = new StreamWriter(tw);             String line;            while ((line = sr.ReadLine()) != null)                sw.WriteLine(line);            sw.Close();        }    }    public interface ITransform    {        byte transform(byte ch);    }    public class Encrypt : ITransform    {        const String str = "xyfagchbimpourvnqsdewtkjzl";        byte ITransform.transform(byte ch)        {            if (char.IsLower((char)ch))                ch = (byte)str[ch - (byte)'a'];            return ch;        }    }    class Decrypt : ITransform    {        const String str = "xyfagchbimpourvnqsdewtkjzl";        byte ITransform.transform(byte ch)        {            if (char.IsLower((char)ch))                ch = (byte)(str.IndexOf((char)ch) + 'a');            return ch;        }    }    class TransformWriter : Stream, IDisposable    {        private Stream outs;        private ITransform trans;         public TransformWriter(Stream s, ITransform t)        {            this.outs = s;            this.trans = t;        }         public override bool CanRead        {            get { return false; }        }         public override bool CanSeek        {            get { return false; }        }         public override bool CanWrite        {            get { return true; }        }        public override void Flush()        {            outs.Flush();        }         public override long Length        {            get { return outs.Length; }        }        public override long Position        {            get            {                return outs.Position;            }            set            {                outs.Position = value;            }        }        public override long Seek(long offset, SeekOrigin origin)        {            return outs.Seek(offset, origin);        }         public override void SetLength(long value)        {            outs.SetLength(value);        }         public override void Write(byte[] buf, int off, int len)        {            for (int i = off; i < off + len; i++)                buf[i] = trans.transform(buf[i]);            outs.Write(buf, off, len);        }         void IDisposable.Dispose()        {            outs.Dispose();        }         public override void Close()        {            outs.Close();        }         public override int Read(byte[] cbuf, int off, int count)        {            return outs.Read(cbuf, off, count);        }    }}`

## C++

The key file should look something like this: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789SWoVR0kJLXQ8zbCd1OagTH5ie3nvYU2wfrM9yI4sKm6c7hNjtADqFPxpEZlBuG

` #include <iostream>#include <string>#include <fstream> class cipher {public:    bool work( std::string e, std::string f, std::string k ) {        if( e.length() < 1 ) return false;        fileBuffer = readFile( f );        if( "" == fileBuffer ) return false;        keyBuffer = readFile( k );        if( "" == keyBuffer ) return false;         outName = f;        outName.insert( outName.find_first_of( "." ), "_out" );         switch( e[0] ) {            case 'e': return encode();            case 'd': return decode();        }        return false;    }private:    bool encode() {        size_t idx, len = keyBuffer.length() >> 1;        for( std::string::iterator i = fileBuffer.begin(); i != fileBuffer.end(); i++ ) {            idx = keyBuffer.find_first_of( *i );            if( idx < len ) outBuffer.append( 1, keyBuffer.at( idx + len ) );            else outBuffer.append( 1, *i );        }        return saveOutput();    }    bool decode() {        size_t idx, l = keyBuffer.length(), len = l >> 1;        for( std::string::iterator i = fileBuffer.begin(); i != fileBuffer.end(); i++ ) {            idx = keyBuffer.find_last_of( *i );            if( idx >= len && idx < l ) outBuffer.append( 1, keyBuffer.at( idx - len ) );            else outBuffer.append( 1, *i );        }        return saveOutput();    }    bool saveOutput() {        std::ofstream o( outName.c_str() );        o.write( outBuffer.c_str(), outBuffer.size() );        o.close();        return true;    }    std::string readFile( std::string fl ) {        std::string buffer = "";        std::ifstream f( fl.c_str(), std::ios_base::in );        if( f.good() ) {            buffer = std::string( ( std::istreambuf_iterator<char>( f ) ), std::istreambuf_iterator<char>() );            f.close();        }        return buffer;    }    std::string fileBuffer, keyBuffer, outBuffer, outName;}; int main( int argc, char* argv[] ) {    if( argc < 4 ) {        std::cout << "<d or e>\tDecrypt or Encrypt\n<filename>\tInput file, the output file will have"        "'_out' added to it.\n<key>\t\tfile with the key to encode/decode\n\n";    } else {        cipher c;        if( c.work( argv[1], argv[2], argv[3] ) ) std::cout << "\nFile successfully saved!\n\n";        else std::cout << "Something went wrong!\n\n";    }    return 0;} `

## D

`import std.stdio;import std.string;import std.traits; string text =`Here we have to do is there will be a input/source file in which we are going to Encrypt the file by replacing every upper/lower case alphabets of the source file with another predetermined upper/lower case alphabets or symbols and save it into another output/encrypted file and then again convert that output/encrypted file into original/decrypted file. This type of Encryption/Decryption scheme is often called a Substitution Cipher.`; void main() {    auto enc = encode(text);    writeln("Encoded: ", enc);    writeln;    writeln("Decoded: ", decode(enc));} enum FORWARD = "[email protected]#E\$F%G^H&I*J(K)L+M=N[O]P{Q}R<S>T/U?V:W;X.Y,Z a\tbcdefghijkl\nmnopqrstuvwxyz";auto encode(string input) {    return tr(input, FORWARD, REVERSE);} enum REVERSE = "VsciBjedgrzy\nHalvXZKtUP um\tGf?I/w>J<x.q,OC:F;R{A]p}n[D+h=Q)W(o*b&L^k%E\$S#[email protected]!T~N";auto decode(string input) {    return tr(input, REVERSE, FORWARD);}`
Output:
```Encoded: aQSQn!Qn([MQnY%n=%no#nY(QSQn!o&&n+Qn[[email protected],#%@ShQLn)o&Qnokn!(oh(n!Qn[SQnW%okWnY%ngkhS~EYnY(Qn)o&Qn+~nSQE&[[email protected],&%!QSnh[#Qn[&E([+QY#n%)nY(Qn#%@ShQn)o&Qn!oY(n[k%Y(QSLnESQ=QYQS^[email protected],&%!QSnh[#Qn[&E([+QY#n%Sn#~^+%&#n[k=n#[MQLnoYnokY%n[k%Y(QSn%@[email protected],QkhS~EYQ=n)o&Qn[k=nY(Qkn[W[oknh%kMQSYLnY([Yn%@[email protected],QkhS~EYQ=n)o&QnokY%n%SoWok[&,=QhS~EYQ=n)o&QAnq(o#LnY~EQn%)ngkhS~EYo%k,eQhS~EYo%kn#h(Q^Qno#n%)YQknh[&&Q=n[[email protected]+#[email protected]%knBoE(QSA

Decoded: Here we have to do is there will be a input/source
file in which we are going to Encrypt the file by replacing every
upper/lower case alphabets of the source file with another
predetermined upper/lower case alphabets or symbols and save
it into another output/encrypted file and then again convert
that output/encrypted file into original/decrypted file. This
type of Encryption/Decryption scheme is often called a
Substitution Cipher.```

## Factor

This program optionally allows the user to specify a file to use as a key. Otherwise, it uses a default.

`USING: assocs combinators combinators.short-circuit command-linehashtables io io.encodings.utf8 io.files kernel math.ordermultiline namespaces qw sequences ;IN: rosetta-code.substitution-cipher CONSTANT: alphabet    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" CONSTANT: default-key    "VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN" SYMBOL: key STRING: usageUsage:  substitution  <encode|decode>  input-file  output-file  [key-file]  (Optional -- for custom alphabet keys.) Example:  substitution encode my-poem.txt my-encoded-poem.txt; : check-args ( seq -- ? )    {        [ length 3 4 between? not ]        [ first qw{ encode decode } member? not ]    } 1|| [ usage print f ] [ t ] if ; : init-key ( seq -- )    dup length 4 = [ last utf8 file-contents ]    [ drop default-key ] if key set ; : >sub-map ( seq -- assoc )    [ alphabet key get ] dip first "encode" = [ swap ] unless    zip >hashtable ; : encipher ( seq assoc -- newseq )    [ dupd at dup [ nip ] [ drop ] if ] curry { } map-as ; : substitute ( seq -- )    { [ init-key ] [ second ] [ >sub-map ] [ third ] } cleave    [ utf8 file-contents ] [ encipher ]    [ utf8 set-file-contents ] tri* ; : main ( -- )    command-line get dup check-args [ substitute ] [ drop ] if ; MAIN: main`
Output:

Contents of key.txt:

```RwfGlELSpqhPeauybIcHDNoKiAnMsvJmFrxQCkUWdtBZVTXOzjgY
```

Contents of in.txt:

```Substitution Cipher Implementation - File Encryption/Decryption

Task - Here we have to do is there will be a input/source file in which we are
going to Encrypt the file by replacing every upper/lower case alphabets of the
source file with another predetermined upper/lower case alphabets or symbols
and save it into another output/encrypted file and then again convert that
output/encrypted file into original/decrypted file.

This type of Encryption/Decryption scheme is often called a Substitution Cipher.
```

Invoking the program to encode:

```substitution.exe encode in.txt out.txt key.txt
```

Contents of out.txt:

```cXMVTxTXTxdW fxtrJZ pUtkJUJWTnTxdW - ExkJ lWsZgtTxdW/GJsZgtTxdW

HnVC - SJZJ zJ rnOJ Td vd xV TrJZJ zxkk MJ n xWtXT/VdXZsJ mxkJ xW zrxsr zJ nZJ
FdxWF Td lWsZgtT TrJ mxkJ Mg ZJtknsxWF JOJZg XttJZ/kdzJZ snVJ nktrnMJTV dm TrJ
VdXZsJ mxkJ zxTr nWdTrJZ tZJvJTJZUxWJv XttJZ/kdzJZ snVJ nktrnMJTV dZ VgUMdkV
nWv VnOJ xT xWTd nWdTrJZ dXTtXT/JWsZgtTJv mxkJ nWv TrJW nFnxW sdWOJZT TrnT
dXTtXT/JWsZgtTJv mxkJ xWTd dZxFxWnk/vJsZgtTJv mxkJ.

HrxV TgtJ dm lWsZgtTxdW/GJsZgtTxdW VsrJUJ xV dmTJW snkkJv n cXMVTxTXTxdW fxtrJZ.
```

Invoking the program to decode:

```substitution.exe decode out.txt decoded.txt key.txt
```

Contents of decoded.txt:

```<same as in.txt>
```

## Fortran

Works with: Fortran version 90 and later
`program substitution  implicit none   integer, parameter :: len_max = 256  integer, parameter :: eof = -1  integer :: in_unit = 9, out_unit = 10, ios  character(len_max) :: line   open(in_unit, file="plain.txt",  iostat=ios)  if (ios /= 0) then    write(*,*) "Error opening plain.txt file"    stop  end if   open(out_unit, file="encrypted.txt", iostat=ios)  if (ios /= 0) then    write(*,*) "Error opening encrypted.txt file"    stop  end if ! Encryption  do     read(in_unit, "(a)", iostat=ios) line    if (ios > 0) then      write(*,*) "Error reading plain.txt file"      stop    else if (ios == eof) then      exit    end if     call cipher(trim(line))    write(out_unit, "(a)", iostat=ios) trim(line)    if (ios /= 0) then      write(*,*) "Error writing encrypted.txt file"      stop    end if  end do   close(in_unit)  close(out_unit)   open(in_unit, file="encrypted.txt",  iostat=ios)  if (ios /= 0) then    write(*,*) "Error opening encrypted.txt file"    stop  end if   open(out_unit, file="decrypted.txt", iostat=ios)  if (ios /= 0) then    write(*,*) "Error opening decrypted.txt file"    stop  end if ! Decryption   do     read(in_unit, "(a)", iostat=ios) line    if (ios > 0) then      write(*,*) "Error reading encrypted.txt file"      stop    else if (ios == eof) then      exit    end if     call cipher(trim(line))    write(out_unit, "(a)", iostat=ios) trim(line)    if (ios /= 0) then      write(*,*) "Error writing decrypted.txt file"      stop    end if  end do     close(in_unit)  close(out_unit) contains subroutine cipher(text)  character(*), intent(in out) :: text  integer :: i ! Substitutes A -> Z, B -> Y ... Y -> B, Z -> A and ditto for lower case! works for both encryption and decryption   do i = 1, len(text)    select case(text(i:i))      case ('A':'Z')        text(i:i) = achar(155 - iachar(text(i:i)))      case ('a':'z')        text(i:i) = achar(219 - iachar(text(i:i)))    end select  end doend subroutine end program `
Output:
```Encrypted file:
Sviv dv szev gl wl rh gsviv droo yv z rmkfg/hlfixv urov rm dsrxs dv ziv
tlrmt gl Vmxibkg gsv urov yb ivkozxrmt vevib fkkvi/oldvi xzhv zokszyvgh
lu gsv hlfixv urov drgs zmlgsvi kivwvgvinrmvw fkkvi/oldvi xzhv zokszyvgh
li hbnyloh zmw hzev rg rmgl zmlgsvi lfgkfg/vmxibkgvw urov zmw gsvm ztzrm
xlmevig gszg lfgkfg/vmxibkgvw urov rmgl lirtrmzo/wvxibkgvw urov.
Gsrh gbkv lu Vmxibkgrlm/Wvxibkgrlm hxsvnv rh lugvm xzoovw z Hfyhgrgfgrlm Xrksvi.

Decrypted file:
Here we have to do is there will be a input/source file in which we are
going to Encrypt the file by replacing every upper/lower case alphabets
of the source file with another predetermined upper/lower case alphabets
or symbols and save it into another output/encrypted file and then again
convert that output/encrypted file into original/decrypted file.
This type of Encryption/Decryption scheme is often called a Substitution Cipher.
```

## FreeBASIC

`' FB 1.05.0 Win64 ' uses same alphabet and key as Ada language exampleConst string1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"Const string2 = "VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN" Sub process(inputFile As String, outputFile As String, encrypt As Boolean)   Open inputFile For Input As #1   If err > 0 Then     Print "Unable to open input file"     Sleep     End   End If   Dim As String alpha, key    If encrypt Then     alpha = string1 : key = string2   Else     alpha = string2 : key = string1   End If        Open outputFile For Output As #2   Dim s As String   Dim p As Integer   While Not Eof(1)     Line Input #1, s     For i As Integer = 0 To Len(s) - 1         If (s[i] >= 65 AndAlso s[i] <= 90) OrElse (s[i] >= 97 AndAlso s[i] <= 122) Then         p =  Instr(alpha, Mid(s, i + 1, 1)) - 1         s[i] = key[p]                End If           Next      Print #2, s   Wend   Close #1 : Close #2End Sub process "plain.txt", "encrypted.txt", trueprocess "encrypted.txt", "decrypted.txt", falsePrintPrint "Press any key to quit"Sleep`
Output:

Encrypted.txt :

```KEwLkRkEkRQh cRWFqb gDWnqDqhkIkRQh - jRnq BhJbTWkRQh/iqJbTWkRQh

tILp - dqbq Yq FISq kQ xQ RL kFqbq YRnn wq I RhWEk/LQEbJq ORnq Rh YFRJF Yq Ibq
CQRhC kQ BhJbTWk kFq ORnq wT bqWnIJRhC qSqbT EWWqb/nQYqb JILq InWFIwqkL QO kFq
LQEbJq ORnq YRkF IhQkFqb WbqxqkqbDRhqx EWWqb/nQYqb JILq InWFIwqkL Qb LTDwQnL
Ihx LISq Rk RhkQ IhQkFqb QEkWEk/qhJbTWkqx ORnq Ihx kFqh ICIRh JQhSqbk kFIk
QEkWEk/qhJbTWkqx ORnq RhkQ QbRCRhIn/xqJbTWkqx ORnq.

tFRL kTWq QO BhJbTWkRQh/iqJbTWkRQh LJFqDq RL QOkqh JInnqx I KEwLkRkEkRQh cRWFqb.

cnRJp Fqbq kQ phQY DQbq.
```

Decrypted.txt = Plain.txt :

```Substitution Cipher Implementation - File Encryption/Decryption

Task - Here we have to do is there will be a input/source file in which we are
going to Encrypt the file by replacing every upper/lower case alphabets of the
source file with another predetermined upper/lower case alphabets or symbols
and save it into another output/encrypted file and then again convert that
output/encrypted file into original/decrypted file.

This type of Encryption/Decryption scheme is often called a Substitution Cipher.

```

## Go

Translation of: Kotlin
`package main import (        "fmt"    "strings") var key = "]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ" func encode(s string) string {    bs := []byte(s)    for i := 0; i < len(bs); i++ {        bs[i] = key[int(bs[i]) - 32]    }    return string(bs)} func decode(s string) string {    bs := []byte(s)    for i := 0; i < len(bs); i++ {        bs[i] = byte(strings.IndexByte(key, bs[i]) + 32)    }    return string(bs)} func main() {    s := "The quick brown fox jumps over the lazy dog, who barks VERY loudly!"    enc := encode(s)    fmt.Println("Encoded: ", enc)    fmt.Println("Decoded: ", decode(enc))}`
Output:
```Encoded:  2bu]E,KHm].Tdc|]4d\]),8M>]dQuT]<bu]U31C]Idf_]cbd].3Tm>]+ZzL]Ud,IUCk
Decoded:  The quick brown fox jumps over the lazy dog, who barks VERY loudly!
```

## IS-BASIC

`100 PROGRAM "SuChiper.bas"110 STRING ST\$(1 TO 2)*52,K\$*1120 LET ST\$(1)="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"130 LET ST\$(2)="VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN"140 CLEAR SCREEN:PRINT "1 - encode, 2 - decode"150 DO160   LET K\$=INKEY\$170 LOOP UNTIL K\$="1" OR K\$="2"180 IF K\$="1" THEN190   INPUT PROMPT "File name: ":NAME\$200   IF OPENFILE(NAME\$) THEN CALL CHIPER(1)210 ELSE220   IF OPENFILE("Encrypte.txt") THEN CALL CHIPER(2)230 END IF240 DEF OPENFILE(N\$)250   LET OPENFILE=0260   WHEN EXCEPTION USE OPENERROR270     OPEN #1:N\$280   END WHEN 290   LET OPENFILE=-1300 END DEF310 DEF CHIPER(FUNC)320   LET EOF=0330   WHEN EXCEPTION USE OPENERROR340     IF FUNC=1 THEN350       OPEN #2:"Encrypte.txt" ACCESS OUTPUT360       LET OUTP=2370     ELSE 380       OPEN #2:"Decrypte.txt" ACCESS OUTPUT390       LET OUTP=1400     END IF 410   END WHEN 420   WHEN EXCEPTION USE IOERROR430     DO 440       GET #1:K\$450       IF UCASE\$(K\$)>="A" AND UCASE\$(K\$)<="Z" THEN460         PRINT #2:ST\$(OUTP)(POS(ST\$(FUNC),K\$));470       ELSE 480         PRINT #2:K\$;490       END IF 500     LOOP UNTIL EOF510   END WHEN 520   HANDLER IOERROR530     IF EXTYPE<>9228 THEN PRINT EXSTRING\$(EXTYPE)540     CLOSE #2550     CLOSE #1560     LET EOF=1570   END HANDLER 580 END DEF 590 HANDLER OPENERROR600   PRINT EXSTRING\$(EXTYPE)610   END620 END HANDLER`

`import Data.Char          (chr)import Data.Maybe         (fromMaybe)import Data.Tuple         (swap)import System.Environment (getArgs) data Command = Cipher String | Decipher String | Invalid alphabet :: Stringalphabet = chr <\$> [32..126] cipherMap :: [(Char, Char)]cipherMap = zip alphabet (shuffle 20 alphabet) shuffle :: Int -> [a] -> [a]shuffle n xs = iterate go xs !! n  where    go [] = []    go xs = go (drop 2 xs) <> take 2 xs convert :: Eq a => [(a, a)] -> [a] -> [a]convert m = map (\x -> fromMaybe x (lookup x m)) runCommand :: Command -> StringrunCommand (Cipher s)   = convert cipherMap srunCommand (Decipher s) = convert (swap <\$> cipherMap) srunCommand Invalid = "Invalid arguments. Usage: simplecipher c|d <text>" parseArgs :: [String] -> CommandparseArgs (x:y:xs)  | x == "c" = Cipher y  | x == "d" = Decipher y  | otherwise = InvalidparseArgs _ = Invalid main :: IO ()main = parseArgs <\$> getArgs >>= putStrLn . runCommand`
Output:
```\$ simplecipher c "The quick brown fox jumped over the lazy dogs."
@Ty3xt}w~3N^zrZ3Rzd3Vt|\yP3zby^3`Ty3Xufp3Pz{v%

\$ simplecipher d '@Ty3xt}w~3N^zrZ3Rzd3Vt|\yP3zby^3`Ty3Xufp3Pz{v%'
The quick brown fox jumped over the lazy dogs.```

## J

Example implementation:

`keysubst=: [`(a.i.])`(a."_)}key=: 'Taehist' keysubst '[email protected]#\$%^&'enc=: a. {~ key i. ]dec=: key {~ a. i. ]    enc 'This is a test.'!\$%^ %^ @ &#^&.   dec '!\$%^ %^ @ &#^&.'This is a test.`

Note that this particular implementation bakes the key itself into the implementations of `enc` and `dec`. Also note that this particular key is rather limited - letters not mentioned in the key encrypt as another identical character. That seems to be sufficient, given the current task description. But of course other approaches are also possible...

## Java

`public class SubstitutionCipher {     final static String key = "]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N"            + "[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ";     static String text = "Here we have to do is there will be a input/source "            + "file in which we are going to Encrypt the file by replacing every "            + "upper/lower case alphabets of the source file with another "            + "predetermined upper/lower case alphabets or symbols and save "            + "it into another output/encrypted file and then again convert "            + "that output/encrypted file into original/decrypted file. This "            + "type of Encryption/Decryption scheme is often called a "            + "Substitution Cipher.";     public static void main(String[] args) {        String enc = encode(text);        System.out.println("Encoded: " + enc);        System.out.println("\nDecoded: " + decode(enc));    }     static String encode(String s) {        StringBuilder sb = new StringBuilder(s.length());         for (char c : s.toCharArray())            sb.append(key.charAt((int) c - 32));         return sb.toString();    }     static String decode(String s) {        StringBuilder sb = new StringBuilder(s.length());         for (char c : s.toCharArray())            sb.append((char) (key.indexOf((int) c) + 32));         return sb.toString();    }}`
```Encoded: "uTu]cu]b3Qu]<d]Id]...><K<,<Kd|]6KMbuTi
Decoded: Here we have to do is... Substitution Cipher.```

## jq

Translation of: Wren
Works with: jq

Works with gojq, the Go implementation of jq

`def key:   "]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ"; def encode:  (key|explode) as \$key  | explode as \$exploded  | reduce range(0;length) as \$i ([];        . + [\$key[ \$exploded[\$i] - 32]] )   | implode; def decode:  (key|explode) as \$key  | explode as \$exploded  | reduce range(0;length) as \$i ([];       \$exploded[\$i] as \$c       | . + [ \$key | index(\$c) + 32] )  | implode ; def task:  "The quick brown fox jumps over the lazy dog, who barks VERY loudly!"   | encode as \$encoded   |"Encoded:  \(\$encoded)",    "Decoded:  \(\$encoded|decode)" ; task`
Output:
```Encoded:  2bu]E,KHm].Tdc|]4d\]),8M>]dQuT]<bu]U31C]Idf_]cbd].3Tm>]+ZzL]Ud,IUCk
Decoded:  The quick brown fox jumps over the lazy dog, who barks VERY loudly!
```

## Julia

Works with: Julia version 0.6
Translation of: Kotlin

Module:

`module SubstitutionCiphers using Compat const key = "]kYV}(!7P\\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ" function encode(s::AbstractString)    buf = IOBuffer()    for c in s        print(buf, key[Int(c) - 31])    end    return String(take!(buf))end function decode(s::AbstractString)    buf = IOBuffer()    for c in s        print(buf, Char(findfirst(==(c), key) + 31))    end    return String(take!(buf))end end  # module SubstitutionCiphers`

Main:

`let s = "The quick brown fox jumps over the lazy dog, who barks VERY loudly!"    enc = SubstitutionCiphers.encode(s)    dec = SubstitutionCiphers.decode(enc)    println("Original: ", s, "\n -> Encoded: ", enc, "\n -> Decoded: ", dec)end`
Output:
```Original: The quick brown fox jumps over the lazy dog, who barks VERY loudly!
-> Encoded: 2bu]E,KHm].Tdc|]4d\]),8M>]dQuT]<bu]U31C]Idf_]cbd].3Tm>]+ZzL]Ud,IUCk
-> Decoded: The quick brown fox jumps over the lazy dog, who barks VERY loudly!```

## Klingphix

`include ..\Utilitys.tlhy " ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"" VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN""A simple example" :Encode %mode !mode    %i %t    \$mode not [rot rot swap rot] if    len [        !i        \$i get swap !t        rot swap find        rot swap get        \$t swap \$i set    ] for    \$mode not [rot rot swap rot] if; dup ?true Encode dup ?false Encode ? " " input`

## Kotlin

Translation of: Java
`// version 1.0.6 object SubstitutionCipher {    val key = "]kYV}(!7P\\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ"     fun encode(s: String): String {        val sb = StringBuilder()        for (c in s) sb.append(key[c.toInt() - 32])        return sb.toString()    }     fun decode(s: String): String {        val sb = StringBuilder()        for (c in s) sb.append((key.indexOf(c) + 32).toChar())        return sb.toString()    }} fun main(args: Array<String>) {    val s = "The quick brown fox jumps over the lazy dog, who barks VERY loudly!"    val enc = SubstitutionCipher.encode(s)    println("Encoded:  \$enc")    println("Decoded:  \${SubstitutionCipher.decode(enc)}")}`
Output:
```Encoded:  2bu]E,KHm].Tdc|]4d\]),8M>]dQuT]<bu]U31C]Idf_]cbd].3Tm>]+ZzL]Ud,IUCk
Decoded:  The quick brown fox jumps over the lazy dog, who barks VERY loudly!
```

## Lambdatalk

The {substitution shift text} function accepts any text containing characters in the set [! " # \$ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z], except the ` character. These characters have charCodes in the range [33..122], (length = 90). The ` character is used to catch and prevent spaces and must not be used. The shift argument can be in the range [0...90] except 5 10 15 29 30 50 53 70 74 which are in conflict with the lambdatalk evaluator.

`  {def small_ascii {S.map fromCharCode {S.serie 33 122}}} -> small_ascii  {S.length {small_ascii}} = 90 {def substitution  {def substitution.r  {lambda {:w :n :s :i}   {if {> :i :n}    then     else {let { {:s :s} {:c {W.char2code {A.get :i :w}}}              } {if {and {>= :c 33} {<= :c 122}}                 then {W.code2char {+ 33 {% {+ :c {- :s 33}} 90}}}                  else {if {= :c 248} then :c else}}          }{substitution.r :w :n :s {+ :i 1}} }}}  {lambda {:s :w}  {let { {:s :s} {:w {S.replace \s by ` in :w}}       } {S.replace `                  by space                  in {substitution.r {A.split :w}                                    {- {W.length :w} 1}                                    :s                                     0}} }}}-> substitution 1) intitial text: {def txt Veni, Vidi, Vici is a Latin phrase popularly attributed to Julius Caesar who, according to Appian, used the phrase in a letter to the Roman Senate around 47 BC after he had achieved a quick victory in his short war against Pharnaces II of Pontus at the Battle of Zela.} -> txt 2) choose the shift: {def shift 13}-> shift // valid in [0...90] except 5 10 15 29 30 50 53 70 74 3) encoding the text  {substitution {shift} {txt}} -> cr!v9mcvqv9mcvpvmv&mnmYn'v!m#u%n&rm#"#(yn%y,mn''%vo('rqm'"mW(yv(&mPnr&n%m*u"9mnpp"%qv!tm'"mN##vn!9m(&rqm'urm#u%n&rmv!mnmyr''r%m'"m'urm_"zn!m r!n'rmn%"(!qmADmOPmns'r%murmunqmnpuvr)rqmnm\$(vpxm)vp'"%,mv!muv&m&u"%'m*n%mntnv!&'m]un%!npr&mVVm"sm]"!'(&mn'm'urmOn''yrm"smgryn; 4) decoding the text  {substitution {- 90 {shift}} {substitution {shift} {txt}}} -> Veni, Vidi, Vici is a Latin phrase popularly attributed to Julius Caesar who, according to Appian, used the phrase in a letter to the Roman Senate around 47 BC after he had achieved a quick victory in his short war against Pharnaces II of Pontus at the Battle of Zela. `

## Lua

`-- Generate a random substitution cipher for ASCII characters 65 to 122function randomCipher ()    local cipher, rnd = {plain = {}, encoded = {}}    for ascii = 65, 122 do        table.insert(cipher.plain, string.char(ascii))        table.insert(cipher.encoded, string.char(ascii))    end    for i = 1, #cipher.encoded do        rnd = math.random(#cipher.encoded)        cipher.encoded[i], cipher.encoded[rnd] = cipher.encoded[rnd], cipher.encoded[i]    end    return cipherend -- Encipher text using cipher.  Decipher if decode is true.function encode (text, cipher, decode)    local output, letter, found, source, dest = ""    if decode then        source, dest = cipher.encoded, cipher.plain    else        source, dest = cipher.plain, cipher.encoded    end    for pos = 1, #text do        letter = text:sub(pos, pos)        found = false        for k, v in pairs(source) do            if letter == v then                output = output .. dest[k]                found = true                break            end        end        if not found then output = output .. letter end    end    return outputend -- Main proceduremath.randomseed(os.time())local subCipher = randomCipher()print("Cipher generated:")print("\tPlain:", table.concat(subCipher.plain))print("\tCoded:", table.concat(subCipher.encoded))local inFile = io.open("C:\\ulua\\taskDescription.txt", "r")local input = inFile:read("*all")inFile:close()local encoded = encode(input, subCipher)print("\nEncoded file contents:")print("\t" .. encoded)print("\nAbove text deciphers to: ")print("\t" .. encode(encoded, subCipher, true))`
Output:
```Cipher generated:
Plain:  ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz

Encoded file contents:
qvkv dv Hrsv Af cf Xt AHvkv dXRR hv r XyKDA/tfDkFv ^XRv Xy dHXFH dv rkv
UfXyU Af zyFkBKA AHv ^XRv hB kvKRrFXyU vsvkB DKKvk/Rfdvk Frtv rRKHrhvAt f^ AHv t
fDkFv ^XRv dXAH ryfAHvk KkvcvAvk`Xyvc DKKvk/Rfdvk Frtv rRKHrhvAt fk tB`hfRt ryc
trsv XA XyAf ryfAHvk fDAKDA/vyFkBKAvc ^XRv ryc AHvy rUrXy FfysvkA AHrA fDAKDA/vy
FkBKAvc ^XRv XyAf fkXUXyrR/cvFkBKAvc ^XRv. [HXt ABKv f^ zyFkBKAXfy/\vFkBKAXfy tF
Hv`v Xt f^Avy FrRRvc r GDhtAXADAXfy ZXKHvk.

Above text deciphers to:
Here we have to do is there will be a input/source file in which we are
going to Encrypt the file by replacing every upper/lower case alphabets of the s
ource file with another predetermined upper/lower case alphabets or symbols and
save it into another output/encrypted file and then again convert that output/en
crypted file into original/decrypted file. This type of Encryption/Decryption sc
heme is often called a Substitution Cipher.```

## MiniScript

`alphabet = "abcdefghijklmnopqrstuvwxyz".split("")cipher = alphabet[0:]cipher.shuffleencode = {}decode = {}for i in alphabet.indexes    encode[alphabet[i]] = cipher[i]    decode[cipher[i]] = alphabet[i]    encode[alphabet[i].upper] = cipher[i].upper    decode[cipher[i].upper] = alphabet[i].upperend for apply = function(map, s)    chars = s.split("")    for i in chars.indexes        if map.hasIndex(chars[i]) then chars[i] = map[chars[i]]    end for    return chars.join("")end function msg = "Now is the time for all good men (and women) to come together."secretCode = apply(encode, msg)print secretCodeprint apply(decode, secretCode)`
Output:
```Rzs ho wft whxt bzv ykk nzzg xtr (yrg szxtr) wz jzxt wzntwftv.
Now is the time for all good men (and women) to come together.```

## Nim

`import sequtils, strutils proc encrypt(key: seq[char]; msg: string): string =  result.setLen(msg.len)  for i, c in msg:    result[i] = key[ord(c) - 32] proc decrypt(key: seq[char]; msg: string): string =  result.setLen(msg.len)  for i, c in msg:    result[i] = chr(key.find(c) + 32) when isMainModule:   import random  randomize()   # Build a random key.  var key = toSeq(32..126).mapIt(chr(it))   # All printable characters.  key.shuffle()   const Message = "The quick brown fox jumps over the lazy dog, who barks VERY loudly!"  let encrypted = key.encrypt(Message)  let decrypted = key.decrypt(encrypted)   echo "Key =       “\$#”" % key.join()  echo "Message =   “\$#”" % Message  echo "Encrypted = “\$#”" % encrypted  echo "Decrypted = “\$#”" % decrypted`
Output:
```Key =       “5`:S<UqJ& aCwQ?lA_bp"dEv*,'@c\$;=FG}o8x\.s-MPrTu~L>[i1N(9Z^h/e#4Hjn]WBXYy7Dg3O+26fKIm|)zkt{R%!0V”
Message =   “The quick brown fox jumps over the lazy dog, who barks VERY loudly!”
Encrypted = “17X5K)DW35]I6k25Y6t5g)+fm56zXI5|7X5OnR{5B6yw5k765]nI3m5(x[^5O6)BO{`”
Decrypted = “The quick brown fox jumps over the lazy dog, who barks VERY loudly!”```

## Perl

Translation of: Java
`sub encode {    my \$source = shift;    my \$key = shift;    my \$out = q();     @ka = split //, \$key;    foreach \$ch (split //, \$source) {        \$idx = ord(\$ch) - 32;        \$out .= \$ka[\$idx];    }     return \$out;} sub decode {    my \$source = shift;    my \$key = shift;    my \$out = q();     foreach \$ch (split //, \$source) {        \$idx = index \$key, \$ch;        \$val = chr(\$idx + 32);        \$out .= \$val;    }     return \$out;} my \$key = q(]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\C1yxJ);my \$text = "Here we have to do is there will be a input/source "         . "file in which we are going to Encrypt the file by replacing every "         . "upper/lower case alphabets of the source file with another "         . "predetermined upper/lower case alphabets or symbols and save "         . "it into another output/encrypted file and then again convert "         . "that output/encrypted file into original/decrypted file. This "         . "type of Encryption/Decryption scheme is often called a "         . "Substitution Cipher."; my \$ct = encode(\$text, \$key);print "Encoded: \$ct\n"; my \$pt = decode(\$ct, \$key);print "Decoded: \$pt\n";`
Output:
```Encoded: "uTu]cu]b3Qu]<d]Id]K>]<buTu]cKUU].u]3]K|M,< >d,THu]4KUu]K|]cbKHb]cu]3Tu]fdK|f]<d]Z|HTCM<]<bu]4KUu].C]TuMU3HK|f]uQuTC],MMuT UdcuT]H3>u]3UMb3.u<>]d4]<bu]>d,THu]4KUu]cK<b]3|d<buT]MTuIu<uT8K|uI],MMuT UdcuT]H3>u]3UMb3.u<>]dT]>C8.dU>]3|I]>3Qu]K<]K|<d]3|d<buT]d,<M,< u|HTCM<uI]4KUu]3|I]<bu|]3f3K|]Hd|QuT<]<b3<]d,<M,< u|HTCM<uI]4KUu]K|<d]dTKfK|3U IuHTCM<uI]4KUui]2bK>]<CMu]d4]Z|HTCM<Kd| %uHTCM<Kd|]>Hbu8u]K>]d4<u|]H3UUuI]3]q,.><K<,<Kd|]6KMbuTi
Decoded: Here we have to do is there will be a input/source file in which we are going to Encrypt the file by replacing every upper/lower case alphabets of the source file with another predetermined upper/lower case alphabets or symbols and save it into another output/encrypted file and then again convert that output/encrypted file into original/decrypted file. This type of Encryption/Decryption scheme is often called a Substitution Cipher.```

## Phix

```constant plain = tagset('Z','A')&tagset('z','a'),
key = shuffle(plain)

function encode(string s, integer decrypt=false)
sequence {p,k} = iff(decrypt?{plain,key}:{key,plain})
for i=1 to length(s) do
integer ki = find(s[i],p)
if ki then s[i] = k[ki] end if
end for
return s
end function

string original = "A simple example.",
encoded = encode(original),
decoded = encode(encoded, true)

printf(1,"original: %s\nencoded: %s\ndecoded: %s\n",{original,encoded,decoded})
```
Output:
```original: A simple example.
encoded: j wqGuMv vsQGuMv.
decoded: A simple example.
```

## Phixmonti

`include ..\Utilitys.pmt " ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"" VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN""A simple example" def Encode    >ps    tps not if >ps swap ps> endif    len for        >ps        tps get swap >ps        rot swap find        rot swap get        ps> swap ps> set    endfor    ps> not if >ps swap ps> endifenddef dup ?true Encode dup ?false Encode ?`
Output:
```A simple example
V LRDWnq qMIDWnq
A simple example

=== Press any key to exit ===```

## PHP

`<?php \$alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';\$key      = 'cPYJpjsBlaOEwRbVZIhQnHDWxMXiCtUToLkFrzdAGymKvgNufeSq'; // Encode input.txt, and save result in output.txtfile_put_contents('output.txt', strtr(file_get_contents('input.txt'), \$alphabet, \$key)); \$source  = file_get_contents('input.txt');\$encoded = file_get_contents('output.txt');\$decoded = strtr(\$encoded, \$key, \$alphabet); echo    '== SOURCE ==', PHP_EOL,    \$source, PHP_EOL, PHP_EOL,    '== ENCODED ==', PHP_EOL,    \$encoded, PHP_EOL, PHP_EOL,    '== DECODED ==', PHP_EOL,    \$decoded, PHP_EOL, PHP_EOL;`
Output:
```== SOURCE ==
Substitution Cipher Implementation - File Encryption/Decryption

Task - Here we have to do is there will be a input/source file in which we are
going to Encrypt the file by replacing every upper/lower case alphabets of the
source file with another predetermined upper/lower case alphabets or symbols
and save it into another output/encrypted file and then again convert that
output/encrypted file into original/decrypted file.

This type of Encryption/Decryption scheme is often called a Substitution Cipher.

== ENCODED ==
vnPhQlQnQlbR ClVBpI kwVEpwpRQcQlbR - TlEp URYIxVQlbR/tpYIxVQlbR

gchO - LpIp Dp BcHp Qb Jb lh QBpIp DlEE Pp c lRVnQ/hbnIYp jlEp lR DBlYB Dp cIp
sblRs Qb URYIxVQ QBp jlEp Px IpVEcYlRs pHpIx nVVpI/EbDpI Ychp cEVBcPpQh bj QBp
hbnIYp jlEp DlQB cRbQBpI VIpJpQpIwlRpJ nVVpI/EbDpI Ychp cEVBcPpQh bI hxwPbEh
cRJ hcHp lQ lRQb cRbQBpI bnQVnQ/pRYIxVQpJ jlEp cRJ QBpR csclR YbRHpIQ QBcQ
bnQVnQ/pRYIxVQpJ jlEp lRQb bIlslRcE/JpYIxVQpJ jlEp.

gBlh QxVp bj URYIxVQlbR/tpYIxVQlbR hYBpwp lh bjQpR YcEEpJ c vnPhQlQnQlbR ClVBpI.

== DECODED ==
Substitution Cipher Implementation - File Encryption/Decryption

Task - Here we have to do is there will be a input/source file in which we are
going to Encrypt the file by replacing every upper/lower case alphabets of the
source file with another predetermined upper/lower case alphabets or symbols
and save it into another output/encrypted file and then again convert that
output/encrypted file into original/decrypted file.

This type of Encryption/Decryption scheme is often called a Substitution Cipher.```

## Picat

Translation of: Prolog
`main =>  S = "The quick brown fox jumped over the lazy dog",  cypher(S,E),  % encrypt  println(E),   cypher(D, E), % decrypt  println(D),   S == D,  println(ok). cypher(O, S) :-  nonvar(O),  var(S),  sub_chars(O,S).cypher(O, S) :-  nonvar(S),  var(O),  sub_chars(O,S). base("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ").subs("VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWob LkESYMTN"). sub_chars(Original,Subbed) :-  base(Base),  subs(Subs),  maplist(\$sub_char(Base,Subs),Original,Subbed). sub_char([Co|_],[Cs|_],Co,Cs) :- !.sub_char([_|To],[_|Ts], Co, Cs) :- sub_char(To,Ts,Co,Cs). maplist(Goal, List1, List2) :-    maplist_(List1, List2, Goal). maplist_([], X, _) :- X = []. maplist_([Elem1|Tail1],         [Elem2|Tail2],         Goal) :-    call(Goal, Elem1, Elem2),    maplist_(Tail1, Tail2, Goal).`
Output:
```tFqNokRJpNwbQShNOQYNAkDWqxNQEqbNLFqNnITMNxQC
The quick brown fox jumped over the lazy dog
ok```

### Using maps

`main =>  S = "The quick brown fox jumped over the lazy dog!!!",  E = encrypt(S),  println(E),  D = decrypt(E),  println(D),   D == S,  println(ok),  nl. encrypt(L) = [EncryptMap.get(C,C) : C in L] =>  base(Base),  subs(Subs),  EncryptMap = new_map([B=S : {B,S} in zip(Base,Subs)]). decrypt(L) = [DecryptMap.get(C,C) : C in L] =>  base(Base),  subs(Subs),  DecryptMap = new_map([S=B : {B,S} in zip(Base,Subs)]). base("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ").subs("VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWob LkESYMTN").`
Output:
```tFqNokRJpNwbQShNOQYNAkDWqxNQEqbNLFqNnITMNxQC!!!
The quick brown fox jumped over the lazy dog!!!
ok```

## PicoLisp

`(setq *A (chop "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"))(setq *K (chop "VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN")) (de cipher (Str D)   (let (K *K  A *A)      (and D (xchg 'A 'K))      (pack         (mapcar            '((N)               (or                  (pick                     '((A K) (and (= A N) K))                     A                     K )                  N ) )            (chop Str) ) ) ) )(and   (println 'encode (cipher "The quick brown fox jumped over the lazy dog's back"))   (println 'decode (cipher @ T)) )`
Output:
```encode "tFq oERJp wbQYh OQM AEDWqx QSqb kFq nINT xQC'L wIJp"
decode "The quick brown fox jumped over the lazy dog's back"```

## Pike

`string alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";string key      = "VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN";mapping key_mapping = mkmapping(alphabet/1, key/1);object c = Crypto.Substitution()->set_key(key_mapping); string msg = "The quick brown fox jumped over the lazy dogs";string msg_enc = c->encrypt(msg);string msg_dec = c->decrypt(msg_enc); write("Encrypted: %s\n", msg_enc);write("Decrypted: %s\n", msg_dec);`
Output:
```Encrypted: tFq oERJp wbQYh OQM AEDWqx QSqb kFq nINT xQCL
Decrypted: The quick brown fox jumped over the lazy dogs
```

## Prolog

`cypher(O, S) :-	nonvar(O),	var(S),	atom_chars(O,Oc),	sub_chars(Oc,Sc),	atom_chars(S,Sc).cypher(O, S) :-	nonvar(S),	var(O),	atom_chars(S,Sc),	sub_chars(Oc,Sc),	atom_chars(O,Oc).	 % mapping based on ADA implementation but have added space character	base(['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,' ']).subs(['V',s,c,i,'B',j,e,d,g,r,z,y,'H',a,l,v,'X','Z','K',t,'U','P',u,m,'G',f,'I',w,'J',x,q,'O','C','F','R','A',p,n,'D',h,'Q','W',o,b,' ','L',k,'E','S','Y','M','T','N']). sub_chars(Original,Subbed) :-	base(Base),	subs(Subs),	maplist(sub_char(Base,Subs),Original,Subbed).	 sub_char([Co|_],[Cs|_],Co,Cs) :- !.sub_char([_|To],[_|Ts], Co, Cs) :- sub_char(To,Ts,Co,Cs).`
Output:
```?- cypher('The quick brown fox jumped over the lazy dog', Result).
Result = tFqNokRJpNwbQShNOQYNAkDWqxNQEqbNLFqNnITMNxQC .

?- cypher(Result, 'tFqNokRJpNwbQShNOQYNAkDWqxNQEqbNLFqNnITMNxQC').
Result = 'The quick brown fox jumped over the lazy dog'.

?-```

## Python

` from string import printableimport random EXAMPLE_KEY = ''.join(sorted(printable, key=lambda _:random.random())) def encode(plaintext, key):    return ''.join(key[printable.index(char)] for char in plaintext) def decode(plaintext, key):    return ''.join(printable[key.index(char)] for char in plaintext) original = "A simple example."encoded = encode(original, EXAMPLE_KEY)decoded = decode(encoded, EXAMPLE_KEY)print("""The original is: {}Encoding it with the key: {}Gives: {}Decoding it by the same key gives: {}""".format(    original, EXAMPLE_KEY, encoded, decoded))`

A straightforward implementation. The output is:

`The original is: A simple example.Encoding it with the key: dV1>r7:TLlJa�uY o]MjH\hI^X	cPN#!fmv[<e=04|O'~{[email protected]}U.WtF*)x/K?Q%S(�RB;25&s6Z9C3+D-_8kn,`Egiwzp"GGives: iPMhX\YiYmJhX\Y5Decoding it by the same key gives: A simple example.`

## Quackery

`  [ stack ]                      is encryption  (   --> s )  [ stack ]                      is decryption  (   --> s )   [ [] 95 times [ i^ join ]    shuffle encryption put ]     is makeencrypt (   -->   )   [ encryption share    0 95 of swap     witheach       [ i^ unrot poke ]     decryption put ]             is makedecrypt (   -->   )   [ makeencrypt makedecrypt ]    is makekeys    (   -->   )   [ witheach [ char ! + emit ] ] is echokey     ( s -->   )   [ encryption release    decryption release ]         is releasekeys (   -->   )   [ [] swap witheach      [ dup char ! char ~ 1+        within if           [ char ! -             encryption share             swap peek char ! + ]        join ] ]                 is encrypt     ( \$ --> \$ )   [ [] swap witheach      [ dup char ! char ~ 1+        within if           [ char ! -             decryption share            swap peek char ! + ]        join ] ]                 is decrypt    ( \$ --> \$ )   randomise  makekeys  say "Encryption key is: " encryption share echokey cr  say "Decryption key is: " decryption share echokey cr  cr  \$ "Encryption matters, and it is not just for spies and philanderers."  say "Plaintext: " dup echo\$ cr  say "Encrypted: " encrypt dup echo\$ cr  say "Decrypted: " decrypt echo\$ cr  releasekeys`
Output:
```Encryption key is: [;s]_O*FmypB&\5Ro:/[email protected]|8K(lZwjh31=v2+,P\$e{f'#"!NTGx?kCb~<Mt%cHY}UJ7>W`SA)D^n4?LQ
Decryption key is: ^]\Wk-[Ix'TUAB3CPSO|/;rG72"[email protected],eyD(amEqH~i_&V?0v`p?t4nK!.\$z%u9fl>XZ8N6MdJ){1+<=#j:RLb*5YFog}

Plaintext: Encryption matters, and it is not just for spies and philanderers.
Encrypted: IY?7DUWM}Y HGWWC7>B GYk MW M> Y}W t`>W b}7 >UMC> GYk U<McGYkC7C7>\
Decrypted: Encryption matters, and it is not just for spies and philanderers.```

## Racket

Uses #REXX input file (in data/substitution.in.txt).

The check-equal? tests assure us that we return the plain text after a cypher/decypher pair; so I don't display the plaintext in the output.

`#lang racket/base(require racket/list racket/function racket/file) (define abc "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz") ;; Used to generate my-key for examples(define (random-key (alphabet abc))  (list->string (shuffle (string->list alphabet)))) (define (cypher/decypher key (alphabet abc))  ;; alist is fine, hashes are better over 40 chars... so alist for  ;; abc, hash for ASCII.  (define ab-chars (string->list alphabet))  (define ky-chars (string->list key))  (define cypher-alist (map cons ab-chars ky-chars))  (define decypher-alist (map cons ky-chars ab-chars))  (define ((subst-map alist) str)    (list->string (map (lambda (c) (cond [(assoc c alist) => cdr] [else c]))                       (string->list str))))  (values (subst-map cypher-alist)          (subst-map decypher-alist))) (define (cypher/decypher-files key (alphabet abc))  (define-values (cypher decypher) (cypher/decypher key alphabet))  (define ((convert-file f) in out #:exists (exists-flag 'error))     (curry with-output-to-file out #:exists exists-flag            (lambda () (display (f (file->string in))))))  (values (convert-file cypher)          (convert-file decypher))) (module+ test  (require rackunit)  (define my-key "LXRWzUrIYPJiVQyMwKudbAaDjSEefvhlqmOkGcBZCFsNpxHTgton")   (define-values (cypher decypher) (cypher/decypher my-key abc))   (define in-text #<<TThe quick brown fox..... jumped overthe lazy dog!T    )  (define cypher-text (cypher in-text))   (define plain-text (decypher cypher-text))  (displayln cypher-text)  (check-equal? plain-text in-text)   (define-values (file-cypher file-decypher) (cypher/decypher-files my-key abc))  (file-cypher "data/substitution.in.txt" "data/substitution.crypt.txt" #:exists 'replace)  (file-decypher "data/substitution.crypt.txt" "data/substitution.plain.txt" #:exists 'replace)  (displayln "---")  (displayln (file->string "data/substitution.crypt.txt"))  (check-equal? (file->string "data/substitution.in.txt")                (file->string "data/substitution.plain.txt")))`
Output:
```dmh sHOfG eNCgZ lCt...
.. kHBFhv CThN
xmh cEno vCq!
---
"zThNo  xCCc  mEp  E  pFhfOlOf  'xmNhpmCcv',
EZv gmhZ xmh HphN htfhhvp xmh xmNhpmCcv,
xmh xCCc ehfCBhp E mOZvNEZfh NExmhN xmEZ E mhcF.
LZo pClxgENh Hphv ehoCZv Oxp xmNhpmCcv gOcc fEHph
vhfNhEphp OZ FNCvHfxOTOxo, ZCx OZfNhEphp.
LZv gmhZ OZvOTOvHEc FNCvHfxp ENh FHx xCqhxmhN FOhfhBhEc,
xmh NhpHcx Op E popxhB xmEx mEp qCZh FEpx Oxp xmNhpmCcv
─── E fCHZxhNFNCvHfxOTh fCcchfxOCZ Cl BOplOx HZOxp xmEx
gCNG EqEOZpx hEfm CxmhN NExmhN xmEZ gOxm hEfm CxmhN."
─── VhNch MENGp

```

## Raku

(formerly Perl 6)

Works with: Rakudo version 2015-11-20

Feed it an action (encode, decode) and a file name at the command line and it will spit out the (en|de)coded file to STDOUT. Redirect into a file to save it. If no parameters are passed in, does the demo encode/decode.

`my \$chr = (' ' .. '}').join('');my \$key = \$chr.comb.pick(*).join(''); # Be very boring and use the same key every time to fit task reqs.\$key = q☃3#}^",dLs*>tPMcZR!fmC rEKhlw1v4AOgj7Q]YI+|pDB82a&XFV9yzuH<WT%N;iS.0e:`G\n['[email protected]_{bk)=-5qx(/?\$JoU☃; sub MAIN (\$action = 'encode', \$file = '') {     die 'Only options are encode or decode.' unless \$action ~~ any 'encode'|'decode';     my \$text = qq:to/END/;        Here we have to do is there will be a input/source file in which         we are going to Encrypt the file by replacing every upper/lower         case alphabets of the source file with another predetermined         upper/lower case alphabets or symbols and save it into another         output/encrypted file and then again convert that output/encrypted         file into original/decrypted file. This type of Encryption/Decryption        scheme is often called a Substitution Cipher.        END     \$text = \$file.IO.slurp if \$file;     say "Key = \$key\n";     if \$file {        say &::(\$action)(\$text);    } else {        my \$encoded;        say "Encoded text: \n {\$encoded = encode \$text}";        say "Decoded text: \n {decode \$encoded}";    }} sub encode (\$text) { \$text.trans(\$chr => \$key) } sub decode (\$text) { \$text.trans(\$key => \$chr) }`
Output:
with no passed parameters:
```Key = 3#}^",dLs*>tPMcZR!fmC rEKhlw1v4AOgj7Q]YI+|pDB82a&XFV9yzuH<WT%N;iS.0e:`G\n['[email protected]_{bk)=-5qx(/?\$JoU

Encoded text:
+`=`3(`3n.x`35b3:b3[-35n`=`3([@@30`3.3[{kq5Z-bq=e`3G[@`3[{3(n[en3
(`3.=`3\b[{\35b3]{e=?k535n`3G[@`30?3=`[email protected][{\3`x`=?3qkk`[email protected](`=3
e.-`[email protected]`5-3bG35n`3-bq=e`3G[@`3([5n3.{b5n`=3k=`:`5`=_[{`:3
qkk`[email protected](`=3e.-`[email protected]`[email protected]{:3-.x`3[53[{5b3.{b5n`=3
bq5kq5Z`{e=?k5`:3G[@`3.{:35n`{3.\.[{3eb{x`=535n.53bq5kq5Z`{e=?k5`:3
G[@`3[{5b3b=[\[{[email protected]:`e=?k5`:3G[@`c39n[-35?k`3bG3]{e=?k5[b{ZQ`e=?k5[b{
-en`_`3[-3bG5`{[email protected]@`:3.3Vq0-5[5q5[b{37[kn`=c

Decoded text:
Here we have to do is there will be a input/source file in which
we are going to Encrypt the file by replacing every upper/lower
case alphabets of the source file with another predetermined
upper/lower case alphabets or symbols and save it into another
output/encrypted file and then again convert that output/encrypted
file into original/decrypted file. This type of Encryption/Decryption
scheme is often called a Substitution Cipher.
```

## REXX

Programming notes:   the cipher key (as used by this REXX program) is stored in a file as two records:

•   the 1st record is the plain-text characters to be encrypted.
•   the 2nd record is the crypt-text characters used for encryption.
•   the two records should be equal in the number of characters.
•   the Nth character of record   1   will be encrypted to the Nth character of record   2.
`/*REXX program implements & demonstrates a substitution cipher for the records in a file*/parse arg fid.1 fid.2 fid.3 fid.4 .              /*obtain optional arguments from the CL*/if fid.1==''  then fid.1= "CIPHER.IN"            /*Not specified?  Then use the default.*/if fid.2==''  then fid.2= "CIPHER.OUT"           /* "      "         "   "   "     "    */if fid.3==''  then fid.3= "CIPHER.KEY"           /* "      "         "   "   "     "    */if fid.4==''  then fid.4= "CIPHER.ORI"           /* "      "         "   "   "     "    */say '    input file: '   fid.1                   /*display the fileID used for  input.  */say '   output file: '   fid.2                   /*   "     "     "     "   "  output.  */say '   cipher file: '   fid.3                   /*   "     "     "     "   " cipher-key*/say 'decrypted file: '   fid.4                   /*   "     "     "     "   "  decrypted*/call closer                                      /*close all files in case they're open.*/           do c=1  while lines(fid.3)\==0        /*read (hopefully 2 records) from key. */           @.c= space( linein(fid.3), 0)         /*assign input record to an  @.  array.*/           end   /*c*/c= c - 1                                         /*adjust the number of records (for DO)*/if c==0                       then call ser fid.3,  'not found or is empty.'if c>2                        then call ser fid.3,  'has too many records  (>2).'if c<2                        then call ser fid.3,  'has too few records   (<2).'if length(@.1)\==length(@.2)  then call ser fid.3,  'has unequal length records.'call encrypt  fid.1, fid.2                       /*encrypt the input file  ───►  output.*/[email protected].1;    @.[email protected].2;   @.2=_                       /*switch the cipher keys for decryption*/call encrypt  fid.2, fid.4                       /*decrypt the output file ───► decrypt.*/call show     'cipher file ('fid.3")" , fid.3    /*display the cipher─key file.         */call show      'input file ('fid.1")" , fid.1    /*   "     "     input     "           */call show     'output file ('fid.2")" , fid.2    /*   "     "    output     "           */call show ' decrypted file ('fid.4")" , fid.4    /*   "     "   decrypted   "           */exit                                             /*stick a fork in it,  we're all done. *//*──────────────────────────────────────────────────────────────────────────────────────*/closer:  do f=1  for 4;   call lineout fid.f;    end  /*f*/;            say;      returnser:     say  '***error!***  file '     arg(1)" "    arg(2);                      exitshow:    say;   say center( arg(1), 79, '═');        "TYPE"  arg(2);              return/*──────────────────────────────────────────────────────────────────────────────────────*/encrypt: parse arg @in,@out                      /* [↓] effectively deletes @out file by*/         call lineout @out,,1                    /*setting pointer to rec#1 for the file*/                                do j=0  while lines(@in)\==0       /*read the input file*/                                call lineout @out, translate( linein(@in), @.2, @.1)                                end   /*j*/         if j==0  then call ser @in, 'is empty.' /*was the file not found or was empty? */         say @in  ' records processed: '   j     /*show the number of records processed.*/         call closer                             /*close all the files to be neat & safe*/         return`

output   when using the default input files:

```    input file:  CIPHER.IN
output file:  CIPHER.OUT
cipher file:  CIPHER.KEY
decrypted file:  CIPHER.ORI

CIPHER.IN  records processed:  10
CIPHER.OUT  records processed:  10

═══════════════════════════cipher file (CIPHER.KEY)════════════════════════════
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
WXYZabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUV

════════════════════════════input file (CIPHER.IN)═════════════════════════════
"Every  tool  has  a  specific  'threshold',
and when the user exceeds the threshold,
the tool becomes a hindrance rather than a help.
Any software used beyond its threshold will cause
decreases in productivity, not increases.
And when individual products are put together piecemeal,
the result is a system that has gone past its threshold
─── a counterproductive collection of misfit units that
work against each other rather than with each other."
─── Merle Parks

═══════════════════════════output file (CIPHER.OUT)════════════════════════════
"Aranu  pkkh  dWo  W  olaYebeY  'pdnaodkhZ',
WjZ sdaj pda qoan atYaaZo pda pdnaodkhZ,
pda pkkh XaYkiao W dejZnWjYa nWpdan pdWj W dahl.
wju okbpsWna qoaZ XaukjZ epo pdnaodkhZ sehh YWqoa
ZaYnaWoao ej lnkZqYperepu, jkp ejYnaWoao.
wjZ sdaj ejZereZqWh lnkZqYpo Wna lqp pkcapdan leaYaiaWh,
pda naoqhp eo W ouopai pdWp dWo ckja lWop epo pdnaodkhZ
─── W YkqjpanlnkZqYpera YkhhaYpekj kb ieobep qjepo pdWp
skng WcWejop aWYd kpdan nWpdan pdWj sepd aWYd kpdan."
─── Ianha LWngo

═════════════════════════ decrypted file (CIPHER.ORI)══════════════════════════
"Every  tool  has  a  specific  'threshold',
and when the user exceeds the threshold,
the tool becomes a hindrance rather than a help.
Any software used beyond its threshold will cause
decreases in productivity, not increases.
And when individual products are put together piecemeal,
the result is a system that has gone past its threshold
─── a counterproductive collection of misfit units that
work against each other rather than with each other."
─── Merle Parks
```

## Ring

` # Project : Substitution Cipher plaintext = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"ciphertext = "ZEBRASCDFGHIJKLMNOPQTUVWXY"test = "flee at once. we are discovered!"encrypt = "SIAA ZQ LKBA. VA ZOA RFPBLUAOAR!" see "Plaintext : " + plaintext + nlsee "Ciphertext : " + ciphertext + nlsee "Test : " + test + nlsee "Encoded : "encodetext = encode(test)see encodetext + nlsee "Decoded : "decodetext = decode(encodetext)see decodetext + nl func encode(test)        str = ""        for n = 1 to len(test)              pos = substr(plaintext, upper(test[n]))              if test[n] = " "                 str = str + " "              elseif test[n] = "!"                 str = str + "!"              elseif test[n] = "."                 str = str + "."              else                 str = str + substr(ciphertext, pos, 1)              ok        next        return str func decode(test)        str = ""        for n = 1 to len(encodetext)              pos = substr(ciphertext, upper(encodetext[n]))              if test[n] = " "                 str = str + " "              elseif test[n] = "!"                 str = str + "!"              elseif test[n] = "."                 str = str + "."              else                 str = str + lower(substr(plaintext, pos, 1))              ok        next        return str `

Output:

```Plaintext : ABCDEFGHIJKLMNOPQRSTUVWXYZ
Ciphertext : ZEBRASCDFGHIJKLMNOPQTUVWXY
Test : flee at once. we are discovered!
Encoded : SIAA ZQ LKBA. VA ZOA RFPBLUAOAR!
Decoded : flee at once. we are discovered!
```

## Ruby

`Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"Key      = "VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN" def encrypt(str) = str.tr(Alphabet, Key)def decrypt(str) = str.tr(Key, Alphabet) str = 'All is lost, he thought. Everything is ruined. It’s ten past three.'p encrypted =   encrypt(str) p decrypt(encrypted) `
Output:
```"Vnn RL nQLk, Fq kFQECFk. BSqbTkFRhC RL bERhqx. gk’L kqh WILk kFbqq."
"All is lost, he thought. Everything is ruined. It’s ten past three."
```

## Scala

`object SubstitutionCipher extends App {  private val key = "]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N" + "[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ"  private val text =    """"It was still dark, in the early morning hours of the twenty-second of December      | 1946, on the second floor of the house at Schilderskade 66 in our town,      | when the hero of this story, Frits van Egters, awoke."""".stripMargin   val enc = encode(text)  println("Encoded: " + enc)  println("Decoded: " + decode(enc))   private def encode(s: String) = {    val sb = new StringBuilder(s.length)    s.map {      case c if (' ' to '~').contains(c) => sb.append(key(c.toInt - 32))      case _ =>    }    sb.toString  }   private def decode(s: String) = {    val sb = new StringBuilder(s.length)    s.map {      case c if (' ' to '~').contains(c) =>        sb.append((key.indexOf(c.toInt) + 32).toChar)      case _ =>    }    sb.toString  }}`
Output:
See it running in your browser by ScalaFiddle (JavaScript, non JVM) or by Scastie (JVM).

## Sidef

Translation of: Julia
`module SubstitutionCipher {     const key = %c"]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ"     func encode(String s) {        var r = ""        s.each {|c|            r += key[c.ord - 32]        }        return r    }     func decode(String s) {        var r = ""        s.each {|c|            r += (key.first_index { _ == c } + 32 -> chr)        }        return r    }}  with ("The quick brown fox jumps over the lazy dog, who barks VERY loudly!") { |s|    var enc = SubstitutionCipher::encode(s)    var dec = SubstitutionCipher::decode(enc)    say("Original: ", s, "\n -> Encoded: ", enc, "\n -> Decoded: ", dec)}`
Output:
```Original: The quick brown fox jumps over the lazy dog, who barks VERY loudly!
-> Encoded: 2bu]E,KHm].Tdc|]4d\]),8M>]dQuT]<bu]U31C]Idf_]cbd].3Tm>]+ZzL]Ud,IUCk
-> Decoded: The quick brown fox jumps over the lazy dog, who barks VERY loudly!```

## Tcl

Here we implement a SubCipher class with three public methods:

• key ?newkey? -- set or return the current substitution key. This validates the key for correspondence with the alphabet, returning an error if something is not right.
• enc plaintext -- encrypt text with the current key
• dec ciphertext -- decrypt text with the current key

The default alphabet is a-zA-Z, but can be overridden by providing an argument to the constructor. A random initial key will be generated at construction time, unless that is also provided as an argument.

`oo::class create SubCipher {    variable Alphabet    variable Key    variable EncMap    variable DecMap    constructor {{alphabet abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ} {cipherbet ""}} {        set Alphabet \$alphabet        if {\$cipherbet eq ""} {            my key [my RandomKey]        } else {            my key \$cipherbet        }    }    method key args {        if {\$args eq ""} {            return \$Key        } elseif {[llength \$args] > 1} {            throw {TCL WRONGARGS} "Expected \"[self class] key\" or \"[self class]\" key keystring"        }        lassign \$args s         set size [string length \$Alphabet]        if {[string length \$s] != \$size} {            return -code error "Key must be \$size chars long!"        }        set encmap {}        set decmap {}        foreach c [split \$Alphabet {}] e [split \$s {}] {            dict set encmap \$c \$e            dict set decmap \$e \$c        }        if {[dict size \$encmap] != \$size} {            return -code error "Alphabet has repeating characters!"        }        if {[dict size \$decmap] != \$size} {            return -code error "Key has repeating characters!"        }        set Key \$s        set EncMap \$encmap        set DecMap \$decmap    }    method RandomKey {} {        set chars \$Alphabet        set key {}        for {set n [string length \$chars]} {\$n > 0} {incr n -1} {            set i [expr {int(rand()*\$n)}]            append key [string index \$chars \$i]            set chars [string range \$chars 0 \$i-1][string range \$chars \$i+1 end]        }        return \$key    }     method enc {s} {        string map \$EncMap \$s    }    method dec {s} {        string map \$DecMap \$s    }}`

Testing looks like this:

`SubCipher create scset text [read [open /etc/motd]]puts "Original:\n\$text\n----\n"puts "Ciphered:\n[set cipher [sc enc \$text]]\n----\n"puts "Decrypted:\n[sc dec \$cipher]\n----\n"puts "Key:\n[sc key]\n----\n"`
Output:
```Original:

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.

----

Ciphered:

eVv yzhQzGwm KnLjDFvF lKZV ZVv CvuKGn MgA/rKnDc mJmZvw Gzv Xzvv mhXZlGzv;
ZVv vcGLZ FKmZzKuDZKhn Zvzwm Xhz vGLV yzhQzGw Gzv FvmLzKuvF Kn ZVv
KnFKOKFDGj XKjvm Kn /Dmz/mVGzv/FhL/*/LhyJzKQVZ.

CvuKGn MgA/rKnDc Lhwvm lKZV TbHIrAeWrY gI ETUUTgeY, Zh ZVv vcZvnZ
yvzwKZZvF uJ GyyjKLGujv jGl.

----

Decrypted:

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.

----

Key:
GuLFvXQVKRNjwnhyozmZDOlcJBTbfCWdMkxqprtgIasUHeAiESYP
----
```

## VBScript

Not too efficient. It generates the key string as an array of ASCII codes. Uses the same routine to encode and to decode.

` option explicitconst maxk=94dim key(94)  a="I'm working on modernizing Rosetta Code's infrastructure. Starting with communications."&_" Please accept this time-limited open invite to RC's Slack.. --Michael Mol (talk) 20:59, 30 May 2020 (UTC)" sub gen     'swaps items not previusly affected by a swap  dim i,m,t  for i=0 to ubound(key)    key(i)=i+32  next  for i=0 to ubound(key)-1    if key(i)=i+32 then      m=i+int(rnd*(maxk-i))      if key(m)=m+32 then        t=key(m):key(m)=key(i):key(i)=t     end if   end if  nextend sub function viewkeydim i,bb=""for i=1 to ubound(key)   b=b&chr(key(i))nextviewkey=bend function  function iif(a,b,c) if a then iif=b else iif =c end if: end function function docode(a)  dim b,i,ch,n  n=maxk+32  b=""  for i=1 to len(a)   ch=asc(mid(a,i,1))   'wscript.echo ch   b=b&chr(key(iif (ch>n or ch<32,0,ch-32)))  next  docode=bend function   randomize timerdim a,b,cgenwscript.echo "Key:   " & viewkey & vbcrlfwscript.echo "Original: " & a & Vbcrlfb=docode(a)wscript.echo "Encoded: "&  b & Vbcrlfc=docode(b)wscript.echo "Decoded: " & c & Vbcrlfwscript.quit(0) `
Output:
```Key:   %Fh.!\Zc)9Q[4\$vaJ2W-65=`*:p<7>[email protected] Y"]H?1XLlnOP+AxVUT3KE',&G|_80t(dgfe#kjiMmNo;qwybu/rSsz{^}~

Original: I'm working on modernizing Rosetta Code's infrastructure. Starting with communications. Please accept this time-limited open invite to RC's Slack.. --Michael Mol (talk) 20:59, 30 May 2020 (UTC)

Decoded: I'm working on modernizing Rosetta Code's infrastructure. Starting with communications. Please accept this time-limited open invite to RC's Slack.. --Michael Mol (talk) 20:59, 30 May 2020 (UTC)

```

## Wren

Translation of: Kotlin
`var key = "]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6\%ZXs\"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ" var encode = Fn.new { |s|    var res = ""    for (c in s) res = res + key[c.bytes[0] - 32]    return res} var decode = Fn.new { |s|    var res = ""    for (c in s) res = res + String.fromByte(key.indexOf(c) + 32)    return res} var s = "The quick brown fox jumps over the lazy dog, who barks VERY loudly!"var enc = encode.call(s)System.print("Encoded:  %(enc)")System.print("Decoded:  %(decode.call(enc))")`
Output:
```Encoded:  2bu]E,KHm].Tdc|]4d\]),8M>]dQuT]<bu]U31C]Idf_]cbd].3Tm>]+ZzL]Ud,IUCk
Decoded:  The quick brown fox jumps over the lazy dog, who barks VERY loudly!
```

## zkl

`class SubstitutionCipher{   // 92 characters: " !"#\$%&" ... "xyz{|}", doesn't include "~"   const KEY="]kYV}(!7P\$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N"             "[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ";   fcn encode(s){ s.apply(fcn(c){ try{ KEY[c.toAsc()-32] }catch{ c } }) }   fcn decode(s){ s.apply(fcn(c){ try{ (KEY.index(c)+32).toChar() }catch{ c } }) }}`
`text:="Here we have to do is there will be a input/source "      "file in which we are going to Encrypt the file by replacing every "      "upper/lower case alphabets of the source file with another "      "predetermined upper/lower case alphabets or symbols and save "      "it into another output/encrypted file and then again convert "      "that output/encrypted file into original/decrypted file. This "      "type of Encryption/Decryption scheme is often called a "      "Substitution Cipher.";encoded:=SubstitutionCipher.encode(text);println(  "Encoded: ",encoded);println("\nDecoded: ",SubstitutionCipher.decode(encoded));`
Output:
```Encoded: "uTu]cu]b3Qu]<d]Id]K>]<buTu]cKUU].u]3]K|M,< >d,THu]4KUu]K|]cbKHb]cu]3Tu]fdK|f]<d]Z|HTCM<]<bu]4KUu].C]TuMU3HK|f]uQuTC],MMuT UdcuT]H3>u]3UMb3.u<>]d4]<bu]>d,THu]4KUu]cK<b]3|d<buT]MTuIu<uT8K|uI],MMuT UdcuT]H3>u]3UMb3.u<>]dT]>C8.dU>]3|I]>3Qu]K<]K|<d]3|d<buT]d,<M,< u|HTCM<uI]4KUu]3|I]<bu|]3f3K|]Hd|QuT<]<b3<]d,<M,< u|HTCM<uI]4KUu]K|<d]dTKfK|3U IuHTCM<uI]4KUui]2bK>]<CMu]d4]Z|HTCM<Kd| %uHTCM<Kd|]>Hbu8u]K>]d4<u|]H3UUuI]3]q,.><K<,<Kd|]6KMbuTi

Decoded: Here we have to do is there will be a input/source file in which we are going to Encrypt the file by replacing every upper/lower case alphabets of the source file with another predetermined upper/lower case alphabets or symbols and save it into another output/encrypted file and then again convert that output/encrypted file into original/decrypted file. This type of Encryption/Decryption scheme is often called a Substitution Cipher.
```