Skipjack

On June 23 of 1998, the National Security Agency (NSA) has published the SKIPJACK cryptographic algorithm specification, which was secret by that time.
Skipjack is it's software implementation in Pascal. It uses 80-bit key, which can be either read from file, or generated from the password you specify. Encoding of the 1MB file lasts about 10 sec on P133.
I use a "Cipher-Block Chaining Mode" in my program. Written in 1999.