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Assume each S-box substitution takes 8 units of time (because of the eight 6-bit substitutions), each P-box permutation takes 4 units of time (counting 1
Assume each S-box substitution takes 8 units of time
(because of the eight 6-bit substitutions), each P-box
permutation takes 4 units of time (counting 1 unit per byte),
each expansion permutation takes 8 units of time (because of
the eight 4-bit expansions and permutations) and each initial
and final permutation takes 8 units. Compute the number of
units of time for an entire 16-round cycle of the DES.
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