four_square

This can be used to encrypt or decrypt a Four-Square cipher. The Four-Square cipher is a polygraphic
substitution cipher that maps digrams of text to two encryption matrices through their position in a square alphabet matrix.

Playfair, Four-Square, Scytale, Columnar Transposition and Autokey methods. Further explanation on methods of classical cryptography can be found at Wikipedia; (<https://en.wikipedia.org/wiki/Classical_cipher>).

Piaras Fahey

cryptography

Encrypts and Decrypts Text Ciphers

four_square function

<dl><dt>message</dt>
<dd>a character vector used as the plaintext to be encrypted or the ciphertext to be decrypted</dd>
<dt>key1</dt>
<dd>a character vector used as the encryption key for the first encryption matrix</dd>
<dt>key2</dt>
<dd>a character vector used as the encryption key for the second encryption matrix</dd>
<dt>encrypt</dt>
<dd>(Default: <code>TRUE</code>) TRUE will encrypt the message, while FALSE will decrypt the message.</dd></dl>

Arguments

Four-Square Cipher — four_square

<dl>

<dt>message</dt>
<dd>a character vector used as the plaintext to be encrypted or the ciphertext to be decrypted</dd>


<dt>key1</dt>
<dd>a character vector used as the encryption key for the first encryption matrix</dd>


<dt>key2</dt>
<dd>a character vector used as the encryption key for the second encryption matrix</dd>


<dt>encrypt</dt>
<dd>(Default: <code>TRUE</code>) TRUE will encrypt the message, while FALSE will decrypt the message.</dd>

</dl>

four_square: Four-Square Cipher

Description

Usage

Value

Arguments

Examples