Counterpane: Crypto-Gram

Crypto-Gram is a free monthly e-mail newsletter on computer security and cryptography from Bruce Schneier (author of Secrets and Lies and Applied Cryptography, inventor of Blowfish and Twofish, CTO and founder of Counterpane Internet Security, Inc., general crypto pundit and occasional crypto curmudgeon).
http://www.counterpane.com/crypto-gram.html