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System and Network Security

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Multiple Choice

Which of the following is/are true about Cipher Block Chaining(CBC) and Cipher Feedback Mode (CFB)?

  1. The cipher feedback mode technique is more efficient as compared to cipher block chaining.
  2. CFB decryption is almost identical to CBC encryption performed in reverse.
  3. In CFB, the changed in the plaintext propagate forever in the ciphertext and encryption cannot be parallelized.
  4. All of the above.
  5. Both (2) and (3).
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