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What are some standard assumptions made in showing the security of a block cipher?
For example, is it commonly assumed that $P\not=NP$? To this end, are there any block ciphers whose security does not rest on the assumption that $P\not=NP$, and if so what are the assumptions?
Furthermore, do there exist any block ciphers that are provably secure under some set of assumptions?

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  • $\begingroup$ The first question about standard assumptions is too broad. But, see this and this for some information. $\endgroup$
    – forest
    Apr 21, 2022 at 20:46

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