Monoalphabetic Substitution Ciphers

**MONOALPHABETIC**,
a MATLAB library which
can apply 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 GNU LGPL license.

**MONOALPHABETIC** is available in
a MATLAB version.

ATBASH, a MATLAB library which applies the Atbash substitution cipher to a string of text.

CAESAR, a MATLAB library which can apply a Caesar Shift Cipher to a string of text.

CHRPAK, a MATLAB library which works with characters and strings.

DICTIONARY_CODE, a MATLAB library which demonstrates how a text file can be compressed and decompressed using a dictionary code.

FILUM, a MATLAB library which can work with information in text files.

ROT13, a MATLAB library which can encipher a string using the ROT13 cipher for letters, and the ROT5 cipher for digits.

- mono_decrypt.m decrypts a string.
- mono_encrypt.m encrypts a string.
- timestamp.m prints the current HMSDMY date as a timestamp;