Chapter 2 (C) –Advanced Encryption Standard. Origins clearly a replacement for DES was needed –have theoretical attacks that can break it –have demonstrated.

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Presentation transcript:

Chapter 2 (C) –Advanced Encryption Standard

Origins clearly a replacement for DES was needed –have theoretical attacks that can break it –have demonstrated exhaustive key search attacks can use Triple-DES – but slow with small blocks US NIST issued call for ciphers in candidates accepted in Jun 98 5 were short-listed in Aug-99 Rijndael was selected as the AES in Oct-2000 issued as FIPS PUB 197 standard in Nov-2001

AES Requirements private key symmetric block cipher 128-bit data, 128/192/256-bit keys stronger & faster than Triple-DES active life of years (+ archival use) provide full specification & design details both C & Java implementations NIST have released all submissions & unclassified analyses

The AES Cipher - Rijndael designed by Rijmen-Daemen in Belgium has 128/192/256 bit keys, 128 bit data an iterative rather than feistel cipher –treats data in 4 groups of 4 bytes –operates an entire block in every round designed to be: –resistant against known attacks –speed and code compactness on many CPUs –design simplicity

Rijndael processes data as 4 groups of 4 bytes (state) has 9/11/13 rounds in which state undergoes: –byte substitution (1 S-box used on every byte) –shift rows (permute bytes between groups/columns) –mix columns (subs using matrix multiply of groups) –add round key (XOR state with key material) initial XOR key material & incomplete last round all operations can be combined into XOR and table lookups - hence very fast & efficient

Rijndael

AES Round

Summary have considered: –the AES selection process –the details of Rijndael – the AES cipher