bifid_delastelle

The bifid cipher is an encryption method that combines a substitution with a Polybius square and a transposition, and uses fractionation to achieve diffusion. 
It was invented by Felix Delastelle.

Classical cryptography methods for words and brief phrases.
Substitution, transposition and concealment (null) ciphers are available, like
Caesar, Vigenère, Atbash, affine, simple substitution, Playfair,
rail fence, Scytale, single column, bifid, trifid, and Polybius ciphers.

Luigi Annicchiarico

ciphertext

Classical Cryptography Methods for Words and Phrases

bifid_delastelle function

<dl><dt>input</dt>
<dd>Word or phrase to be encrypted,
or character vector with the sequence of coordinate numbers if we need to decrypt</dd>
<dt>key</dt>
<dd>key Word for creating the modified Polybius square</dd>
<dt>period</dt>
<dd>period length for splitting the input phrase. If greater or equal to the length of the input then the split is not executed</dd>
<dt>encrypt</dt>
<dd>If `TRUE` (default), the program ciphers the input word, If `FALSE`, the program decrypts it.</dd></dl>

Arguments

bifid_delastelle — bifid_delastelle

<dl>

<dt>input</dt>
<dd>Word or phrase to be encrypted,
or character vector with the sequence of coordinate numbers if we need to decrypt</dd>


<dt>key</dt>
<dd>key Word for creating the modified Polybius square</dd>


<dt>period</dt>
<dd>period length for splitting the input phrase. If greater or equal to the length of the input then the split is not executed</dd>


<dt>encrypt</dt>
<dd>If `TRUE` (default), the program ciphers the input word, If `FALSE`, the program decrypts it.</dd>

</dl>

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bifid_delastelle: bifid_delastelle

Description

Usage

Value

Arguments

References

Examples