E2ReviewQSols

# E2ReviewQSols - 9 B 8 5 5 S 12*4*67-0 10011011 0 01001101 1...

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CIS 3362 Exam #2 Review Solutions 1) The key length is 9. (The message is of length 27 and 3 doesn't work, even when trying all 6 permutations.) The encryption key is 3, 8, 6, 1, 9, 5, 2, 7, 4. Plaintext: examnumbertwowill beopenbook 2) Here is the grid: homes 24315 goodl uckto thepr ogram mingt eamzz Ciphertext: dtpagzgutomeokernmochgialormtz 3) Here is the binary string broken into blocks of 4: 0110 1101 1111 0101 0011 1010 6 D F 5 3 A 4) 9a6f3 = 1001 1010 0110 1111 0011 b3d76 = 1011 0011 1101 0111 0110 ------------------------ 0010 1001 1011 1000 0101 2

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Unformatted text preview: 9 B 8 5 5) S 12*4*67*- --------0 10011011 0 01001101 1 00100110 1 10010011 0 11001001 6) We know the following: a1bcde abcdef ghijkl ghijkl------ ------100101 101110 So, we obtain that h = 1. Which means b is 1. Then I is 1. So c is 0, j=1, d=0, k=0, e=1, l=0 and f=0. So the solution is bcdef = 10010. 7) The input to the first four S-boxes in binary is: 1001 0010 0011 1111 1010 0000 Rewrite this in blocks of 6 bits: S1 S2 S3 S4 100100 100011 111110 100000 Row 2 Row 3 Row 2 Row 2 Col 2 Col 1 Col 15 Col 0 Out: E 8 7 A...
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E2ReviewQSols - 9 B 8 5 5 S 12*4*67-0 10011011 0 01001101 1...

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