Bifid cipher: Difference between revisions
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[[Category:Encryption]]
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;Description
The [[wp:Bifid_cipher|'''Bifid cipher''']] is a polygraphic substitution cipher which was invented by [[wp:Félix_ Delastelle|Félix Delastelle]] in around 1901. It uses a 5 x 5 [[wp:Polybius_square|Polybius square]] combined with transposition and fractionation to encrypt a message. Any 5 x 5 Polybius square can be used but, as it only has 25 cells and there are 26 letters of the (English) alphabet, one cell needs to represent two letters - I and J being a common choice.
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