Question

1.In CTR mode, cipher blocks 3 and 4 are entirely corrupted. Find the possible corrupted bits in the plaintext.

2. In OFB mode, the entire ciphertext block 11 is corrupted (r = 8), Find the possible corrupted bits in the plaintext.

3.Prove that the plaintext used by Alice is recovered by Bob in CFB mode.

4. Prove that the plaintext used by Alice is recovered by Bob in OFB mode.

5. Prove that the plaintext used by Alice is recovered by Bob in CTR mode.

6. Show the diagram for encryption and decryption in the CFB mode when r = n.
7. Show the diagram for encryption and decryption in the OFB mode when r = n.
8. Show the processes used for decryption algorithm in ECB mode if ciphertext stealing (CTS) is used.

Answer 1

Answer:

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