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• AES is a block cipher with a block length of 128 bits. Most of our discussion will assume that the key length is 128 bits. Advanced Encryption Standard (AES) algorithm is one of the most common and widely used symmetric block cipher algorithm. This algorithm has its own particular structure to encrypt and decrypt sensitive data and is applied in hardware and software, AES selection process • September 12, 1997: the NIST publicly calls for nominees for the new AES • 1st AES conference, August 20-23, 1998 – (15 algorithms are candidates for becoming AES) • Public Review of the algorithms • 2nd AES conference, March 22-23, 1999 – (presentation, analysis and testing) • AES allows for three different key lengths: 128, 192, or 256 bits. 7.3 Substitute Bytes This stage (known as SubBytes) is simply a table lookup using a 16×16matrix of byte values called an s-box. Chapter 7 The AES Algorithm Figure 7.1: Overall structure of the AES algorithm. [With regard to using a key length other than 128 bits, the main thing that changes in AES is how you generate the This matrix consists of all the possible combinations of an 8bit sequence (28 = 16 × 16 = 256).

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