Advanced Encryption Standard (AES)

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Presentation transcript:

Advanced Encryption Standard (AES) Convert to state array (Block-to-state and state-to-block transformation) Input block: 4 8 12 1 5 9 13 2 6 10 14 3 7 11 15 S0,0 S0,1 S0,2 S0,3 S1,0 S1,1 S1,2 S1,3 S2,0 S2,1 S2,2 S2,3 S3,0 S3,1 S3,2 S3,3 = 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Advanced Encryption Standard (AES) Transformation using the S-Box SubBytes( ) transformation table 00 44 88 CC 11 55 99 DD 22 66 AA EE 33 77 BB FF 55

Advanced Encryption Standard (AES) MixColumns() transformation S’0,c = ({02}  S0,c)  ({03}  S1,c)  S2,c  S3,c S’1,c = S0,c  ({02}  S1,c)  ({03}  S2,c)  S3,c S’2,c = S0,c  S1,c  ({02}  S2,c )  ({03}  S3,c) S’3,c = ({03}  S0,c)  S1,c  S2,c  ({02}  S3,c MixColumns() S0,1 S1,1 S2,1 S3,1 S’0,1 S’1,1 S’2,1 S’3,1 S0,0 S0,1 S0,2 S0,3 S1,0 S1,1 S1,2 S1,3 S2,0 S2,1 S2,2 S2,3 S3,0 S3,1 S3,2 S3,3 S’0,0 S’0,1 S’0,2 S’0,3 S’1,0 S’1,1 S’1,2 S’1,3 S’2,0 S’2,1 S’2,2 S’2,3 S’3,0 S’3,1 S’3,2 S’3,3

Advanced Encryption Standard (AES) Add round key XOR S0,1 S1,1 S2,1 S3,1 S0,0 S0,1 S0,2 S0,3 S1,0 S1,1 S1,2 S1,3 S2,0 S2,1 S2,2 S2,3 S3,0 S3,1 S3,2 S3,3 S’0,1 S’1,1 S’2,1 S’3,1 R0,1 R1,1 R2,1 R3,1 S’0,0 S’0,1 S’0,2 S’0,3 S’1,0 S’1,1 S’1,2 S’1,3 S’2,0 S’2,1 S’2,2 S’2,3 S’3,0 S’3,1 S’3,2 S’3,3 R0,0 R0,1 R0,2 R0,3 R1,0 R1,1 R1,2 R1,3 R2,0 R2,1 R2,2 R2,3 R3,0 R3,1 R3,2 R3,3

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