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Can a parallel computer (which can do many operations simultaneously) perform Cipher Block Chaining (CBC) block...

Can a parallel computer (which can do many operations simultaneously) perform Cipher Block Chaining (CBC) block cipher mode decryption faster than encryption? Explain your answer.

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Answer #1
  • No, in CBC block cipher mode decryption doesn’t faster than encryption.
  • Because in CBC mode, the current plaintext block is appended to the before ciphertext block, and afterward the result is encrypted with the key.
  • Decryption is the reverse process, which engages decrypting the present ciphertext and then attaching the before ciphertext block to the end result.
  • So that the error in transmission gets propagated to little further block during decryption due to chaining cause.
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