monoalphabetic, an Octave code which applies a monoalphabetic substitution cipher to a string of text.
A code is specified by listing 26 symbols that are to be used to replace the characters "A" through "Z" in the text. (Note that, before encryption, the string is capitalized.) The same code can be used to reverse the encryption process.
The computer code and data files described and made available on this web page are distributed under the MIT license
monoalphabetic is available in a MATLAB version and an Octave version.
atbash, an Octave code which applies the Atbash substitution cipher to a string of text.
caesar, an Octave code which can apply a Caesar Shift Cipher to a string of text.
chrpak, an Octave code which works with characters and strings.
dictionary_code, an Octave code which demonstrates how a text file can be compressed and decompressed using a dictionary code.
filum, an Octave code which can work with information in text files.
rot13, an Octave code which can encipher a string using the ROT13 cipher for letters, and the ROT5 cipher for digits.