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L11-Block Ciphers-3 - Advanced Encryption Standard(AES...

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Advanced Encryption Standard (AES) Advanced Encryption Standard (AES) - - History History 1997: NIST requests proposals for a new block cipher to replace DES NIST required that the algorithm be: A symmetric-key cryptosystem A block cipher Capable of supporting a block size of 128 bits Capable of supporting key lengths of 128, 192, and 256 bits Available on a worldwide, non-exclusive, royalty- free basis About 20 algorithms selected for the next round Finally, Rijndael was selected in 2001.
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AES AES The The Rijndael Rijndael Algorithm ( Algorithm ( Daemen Daemen , , Rijmen Rijmen ) ) Symmetric-key block cipher Block size 128 bits Key length 128/192/256 bits Performs several rounds of operations to transform each block of plaintext into a block of ciphertext The number of rounds depends on the block size and key size: 10 rounds if key size 128 bits 12 rounds if key size 192 bits 14 rounds if key size 256 bits
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AES AES Basic Components Basic Components
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