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<strong>AES</strong> Algorithm Key Expansion If ( i%N k == 0 ) rotate word left 1 byte process each byte through sbox temp = CC DD EE FF temp = DD EE FF CC temp = sbox[DD] sbox[EE] sbox[FF] sbox[CC] = C1 28 16 4B XOR with RCON[i/N k -1] RCON[0] = 01 temp = (C1 ⨁ 01) 28 16 4B temp = C0 28 16 4B
Con – round Constants Powers of x = 0x02 i 0 1 2 3 4 5 6 7 x i 0x01 0x02 0x04 0x08 0x10 0x20 0x40 0x80 Powers of x = 0x02 i 8 9 A B C D E x i 0x1b 0x36 0x6c 0xd8 0xab 0x4d 0x9a • rCon can be implemented with a look-up-table • 2 i in GF(2 8 ) • Removes symmetry and linearity from key expansion.
Page 1 and 2: AES Advanced Encryption Standard CS
Page 3 and 4: AES Block • AES has a fixed block
Page 5 and 6: AES Key or 192 bits (6 words) 11223
Page 7 and 8: Security • The key security featu
Page 9 and 10: AES Algorithm KeyExpansion(byte key
Page 11 and 12: - Sample Key: AES Algorithm Key Exp
Page 13: AES Algorithm Key Expansion w[0] 11
Page 17 and 18: AES Algorithm Key Expansion w[0] 11
Page 19 and 20: AES Algorithm Key Expansion w[0] 11
Page 21 and 22: AES Algorithm KeyExpansion(byte key
Page 23 and 24: AES Algorithm AddRoundKey State 41
Page 25 and 26: AES Algorithm SubBytes • SubBytes
Page 27 and 28: AES Algorithm SubBytes X Y 0 1 2 3
Page 29 and 30: AES Algorithm SubBytes State 50 10
Page 31 and 32: AES Algorithm ShiftRows • Simple
Page 33 and 34: AES Algorithm - MixColumns • This
Page 35 and 36: AES Algorithm - InvMixColumns a ’
Page 37 and 38: Sample Conversions Input String Key
Page 39 and 40: Larger Plain Texts Encryption • H
Page 41 and 42: Larger Plain Texts Encryption Ciphe
Page 43 and 44: Padding • If plaintext messages a
Page 45 and 46: Attacks on AES • XSL Cryptanalysi
Page 47 and 48: Types of Side Channel Attacks • T
Page 49 and 50: Joan Daemen & Vincent Rijmen’s AE
Page 51 and 52: Joan Daemen & Vincent Rijmen’s AE
Page 53 and 54: References Security and Attacking A
Page 55: References Applications / Implement

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