Tutorial 3 - CEN 448 Tutorial 3 Ans a Key 0000 0001 0010...

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CEN 448 Tutorial 3 Ans.: a) Key: 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 STEP 1: Fill the key in an 8x8 table starting from left to right. 1 2 3 4 5 6 7 8 1 0 0 0 0 0 0 0 1 8 9 0 0 1 0 0 0 1 1 16 17 0 1 0 0 0 1 0 1 24 25 0 1 1 0 0 1 1 1 32 33 1 0 0 0 1 0 0 1 40 41 1 0 1 0 1 0 1 1 48 49 1 1 0 0 1 1 0 1 56 57 1 1 1 0 1 1 1 1 64 57 58 59 60 61 62 63 64
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STEP 2: Copy Table but with removing the 8 th column (shaded column). 1 2 3 4 5 6 7 1 0 0 0 0 0 0 0 7 9 0 0 1 0 0 0 1 15 17 0 1 0 0 0 1 0 23 25 0 1 1 0 0 1 1 31 33 1 0 0 0 1 0 0 39 41 1 0 1 0 1 0 1 47 49 1 1 0 0 1 1 0 55 57 1 1 1 0 1 1 1 63 57 58 59 60 61 62 63 STEP 3: Using PC-1 Table, perform permutation (use the colors for faster filling). 1 2 3 4 5 6 7 1 0 0 0 0 0 0 0 7 9 0 0 1 0 0 0 1 15 17 0 1 0 0 0 1 0 23 25 0 1 1 0 0 1 1 31 33 1 0 0 0 1 0 0 39 41 1 0 1 0 1 0 1 47 49 1 1 0 0 1 1 0 55 57 1 1 1 0 1 1 1 63 57 58 59 60 61 62 63 1 2 3 4 5 6 7 1 1 1 1 1 0 0 0 7 9 0 1 1 0 0 1 1 15 17 0 0 1 0 1 0 1 23 25 0 1 0 0 0 0 0 31 33 1 0 1 0 1 0 1 39 41 0 1 1 0 0 1 1 47 49 0 0 1 1 1 1 0 55 57 0 0 0 0 0 0 0 63 57 58 59 60 61 62 63 STEP 4: Left Circular Shift with One bit according the round number in Table 3.4d.
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