Comments (1)
lvh
commented on June 24, 2024
Are you looking at the RC4 stuff? You may want to check out this PR: #375 (comment) since a paragraph that first introduces permutations is currently being edited.
Two bytes can not map to the same value. What this sentence is trying to say is that all byte values will occur in the array exactly once, so every byte will be mapped to some (exactly 1) byte. Some people assume that this must mean there are no mappings of a byte to itself (still only 1 byte!), but that's not the case: fixed points are quite common. To rephrase, for some byte values b, p(b) = b. Does that make sense?
from book.
Related Issues (20)
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from book.