Maurice Tutor

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    Argosy University/ Phoniex University/
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    Oct-2001 - Nov-2016

Category > Computer Science Posted 23 Sep 2017 My Price 3.00

Feistel cipher structure,

Under the subsection on the motivation for the Feistel cipher structure, it was stated that, for a block of n bits, the number of different reversible mappings for the ideal block cipher is 2n!  Justify.

In that same discussion, it was stated that for the ideal block cipher, which allows all possible reversible mappings, the size of the key is nx2n bits. But, if there are2n! possible mappings, it should take log2 2n!  bits to discriminate among the different mappings, and so the key length should be log2 2n . However, log22n .<n x2nExplain the discrepancy.

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

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