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

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
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 b lock c iphe r – 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.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
AES AES Basic Components Basic Components
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/15/2010 for the course CSE IT325 taught by Professor Maniklaldas during the Fall '09 term at Punjab Engineering College.

Page1 / 13

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online