Maurice Tutor

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Teaching Since: May 2017
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Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 23 Sep 2017 My Price 3.00

bitwise complement

1. Let X’ be the bitwise complement of. Prove that if the complement of the plaintext block is taken and the complement of an encryption key is taken, then the result of DES encryption with these values is the complement of the original cipher text. That is,

If Y = E(K, X)

Then Y’ = E(K’, X’) 

2. Show that in DES the first 24 bits of each sub key come from the same subset of 28 bits of the initial key and that the second 24 bits of each sub key come from a disjoint subset of 28 bits of the initial key.

Answers

Maurice Tutor
(5)
Status NEW Posted 23 Sep 2017 09:09 AM My Price 3.00

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