Actually, you rarely want a predictable nonce as well. The difference is that a nonce must not repeat (or repetition is statistically irrelevant). Even per wik

Actually, you rarely want a predictable nonce as well. The difference is that a nonce must not repeat (or repetition is statistically irrelevant). Even per wikipedia, many often refer to an IV as a nonce: http://en.wikipedia.org/wiki/Cryptographic_nonce http://en.wikipedia.org/wiki/Cryptographic_nonce