Schneier on Security

B. Schneier, The Blowfish Encryption Algorithm—One Year Later, Dr. Dobb's Journal, September 1995.

B. Schneier, Description of a New Variable-Length Key, 64-Bit Block Cipher (Blowfish), Fast Software Encryption, Cambridge Security Workshop Proceedings (December 1993), Springer-Verlag, 1994, pp. 191-204.