playfair

The Playfair cipher is a symmetric method which encrypts pairs of letters
 using a modified Polybius square

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, and Polybius ciphers.

Luigi Annicchiarico

ciphertext

Classical Cryptography Methods for Words and Phrases

playfair function

<dl><dt>word</dt>
<dd>Word or phrase to be encrypted or decrypted</dd>
<dt>key</dt>
<dd>Word for creating the modified Polybius square</dd>
<dt>added_letter</dt>
<dd>Letter to be added in case two letters of a pair are identical; usually "x" is used</dd>
<dt>decrypt</dt>
<dd>If `FALSE` (default), the program ciphers the input word, If `TRUE`, the program decrypts it.</dd></dl>

Arguments

playfair — playfair

<dl>

<dt>word</dt>
<dd>Word or phrase to be encrypted or decrypted</dd>


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


<dt>added_letter</dt>
<dd>Letter to be added in case two letters of a pair are identical; usually "x" is used</dd>


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

</dl>

playfair: playfair

Description

Usage

Value

Arguments

References

Examples