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The XOR state is irreversible without the proper key which is what I understand, so whats the point of all of the other operations that happen on the key? Suppose all we had was secret keys and the XOR operation. Well, actually, it is possible to build a secure cipher out of that, called the one time pad. One time pads offer perfect secrecy, but suffer ...


3

All of the mathematical operations within the s-boxes, shift row, and mix column should be known to the attacker, correct? Yes, see Kerckhoff's principle I understand they could be hard to calculate but aren't they static operations for the most part? I'm interpreting "static operations" to mean subBytes + shiftRows + mixColumns + addRoundKey, and that ...



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