AES Guest Lecturer

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<strong>AES</strong> Algorithm Encryption PlainText Decryption Cipher Text RoundKey AddRoundKey 1 st Round RoundKey * AddRoundKey 1 st Round SubBytes InvShiftRows RoundKey ShiftRows MixColumns AddRoundKey Repeat N r -1 Round RoundKey * InvSubBytes AddRoundKey InvMixColumns Repeat N r -1 Round RoundKey SubBytes ShiftRows AddRoundKey Last Round RoundKey * InvShiftRows InvSubBytes AddRoundKey Last Round CipherText Plain Text * RoundKey Added in reverse order
Larger Plain Texts Encryption • How to encrypt texts larger than 16 bytes • Answer: Encrypt one block at a time Electronic CodeBook Mode But this can be subject to frequency analysis
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: Sample Conversions Input String Key
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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