caesar, a Fortran90 code which applies a Caesar shift cipher to a string of text.
The information on this web page is distributed under the MIT license.
caesar is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
atbash, a Fortran90 code which applies the Atbash substitution cipher to a string of text.
chrpak, a Fortran90 code which works with characters and strings.
filum, a Fortran90 code which can work with information in text files.
rot13, a Fortran90 code which can encipher a string using the ROT13 cipher for letters, and the ROT5 cipher for digits.