Question: a . In Section 4 . 1 , under the subsection on the motivation for the Feistel cipher structure, it was stated that, for a

.

In Section

4.1,

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

2

! .

Justify.

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