Twofish is a 128-bit symmetric block cipher with a variable key length (128, 192, or 256 bits) key, developed by Counterpane Labs. It is unpatented and free for all uses, as described at http://www.counterpane.com/twofish.html. It has been one of the five finalists for AES. This module is written in pure Perl, it should run everywhere where Perl runs. WWW: http://search.cpan.org/dist/Crypt-Twofish_PP/