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(Solution Download) Compare cipher block chaining with cipher feedback mode in terms of the number of encryption...

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1. Suppose that a message has been encrypted using DES in counter mode. One bit of ciphertext in block Ci is accidentally transformed from a 0 to a 1 during transmission. How much plaintext will be garbled as a result?

 

2. Now consider ciphertext block chaining again. Instead of a single 0 bit being transformed into a 1 bit, an extra 0 bit is inserted into the ciphertext stream after block Ci . How much plaintext will be garbled as a result?

 

3. Compare cipher block chaining with cipher feedback mode in terms of the number of encryption operations needed to transmit a large file. Which one is more efficient and by how much?

 







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This question was answered on: Oct 24, 2017

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