CAESAR is a MATLAB library which can apply a Caesar Shift Cipher to a string of text.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
CAESAR is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
ATBASH, a MATLAB library which applies the Atbash substitution 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.
MONOALPHABETIC, a MATLAB library which can apply a monoalphabetic substitution cipher to a string of text.
ROT13, a MATLAB library which can encipher a string using the ROT13 cipher for letters, and the ROT5 cipher for digits.
You can go up one level to the MATLAB source codes.