AES Guest Lecturer

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Attacks on AES • Side Channel Attacks – Attacks based on studying and measuring the actual implementation of the code. – For some implementations of AES the key has been obtained in under 100 minutes. • Computer running AES was 850MHz, Pentium III running FreeBSD 4.8
Types of Side Channel Attacks • Timing Attacks – Watches movement of data in and out of the CPU or memory. – It is difficult to retrieve an array element in a time that is not dependent on the index value. • Power Attacks – Watches power consumption by CPU or memory. – Changing one bit requires considerably less power than changing all bits in a byte.
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 and 14: AES Algorithm Key Expansion w[0] 11
Page 15 and 16: Con - round Constants Powers of x =
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: Attacks on AES • XSL Cryptanalysi
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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