Tutorial4

# Tutorial4 - SCR3443 Tutorial 4 MODERN CRYPTOGRAPHY 1...

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SCR3443 Tutorial 4: MODERN CRYPTOGRAPHY 1. Distinguish between a modern and a traditional symmetric-key cipher. 2. List some components of a modern block cipher. 3. Define a P-Box and list its three variations. Which variation is invertible? 4. Define an S-box and mention the necessary condition for an S-box to be invertible. 5. A transposition block has 10 inputs and 10 outputs. What is the order of the permutation group? What is the key size? 6. A substitution block has 10 inputs and 10 outputs. What is the order of the permutation group? What is the key size? 7. a. Show the result of 3-bit circular left shift on word (10011011) 2 . b. Show the result of 3-bit circular right shift on the word resulting from 3(a). c. Compare the result of Part b with the original word in 3(a). 8. a. Swap the word (10011011) 2 . b. Swap the word resulting from 4(a). c. Compare the result of 4(a)and 4(b) to show that swapping is a self-invertible operation. 9. Find the result of the following operations: a. (01001101) (01001101) b. (01001101) (10110010) c. (01001101) (00000000) d. (01001101) (11111111) 10.

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