New answers tagged substitution-cipher
3
A good encryption should produce data that are indistinguishable from a random stream. If you simply replace bytes with other bytes, and each byte has always the same replacement, many statistical characteristics of the original message remain. For instance, if the original message is text, then the frequency of each letter will remain also after applying ...
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If you are doing a software implementation, the MixColumns would take the longest because you have to do a multiply after pulling from memory and then putting it back. Generally speaking, in software you would use lookup tables for the naive approach, so everything that is not cached would be expensive. I say this is naive because it is susceptible to ...
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