网页Computer and Network Security by Avi Kak Lecture8 8.1: SALIENT FEATURES OF AES •AES is a block cipher with a block length of 128 bits. •AES allows for three different key lengths: 128, 192, or 256 bits. Most of our discussion will assume that the key length is 128 bits. [With regard to using a key length other than 128 bits,