This process is described further in the article Rijndael MixColumns. Most AES calculations are done in a particular finite field.ĪES operates on a 4 × 4 column-major order array of 16 bytes b 0, b 1. By contrast, Rijndael per se is specified with block and key sizes that may be any multiple of 32 bits, with a minimum of 128 and a maximum of 256 bits. AES is a variant of Rijndael, with a fixed block size of 128 bits, and a key size of 128, 192, or 256 bits. Unlike its predecessor DES, AES does not use a Feistel network.
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