Multiple choice

Which of the following ways of combining and feeding back the inputs and outputs of a cipher is the one in which it hides the pattern in the plain text by systematically combining each block with a ciphertext before actually encrypting it?

  1. Cipher block chaining

  2. Electronic code book mode

  3. Cipher feedback

  4. Output feedback

  5. Public key encryption

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A Correct answer
Explanation

This is the way of combining and feeding back the inputs and outputs of a cipher which hides the pattern in the plain text by systematically combining each block with a cipher text before actually encrypting it.