Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 17 Jul 2017 My Price 5.00

DES in counter mode

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?

Answers

Maurice Tutor
(5)
Status NEW Posted 17 Jul 2017 04:07 PM My Price 5.00

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