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by beagle3
2055 days ago
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Can you give an example (or at least a sketch) of how, e.g. AES-128 on top of, or below, DES, is weaker than either? The claims of "weakened by combining" are often aired, but all examples I've found so far are basically summarized as "remaining within a group structure" (as in your rubik's cube example whose god number is 20) - which might not be stronger than each individual, but is unlikely to be weaker either -- and algorithm combinations usually DON'T remain within a group structure (e.g. DES is not a group, so 3DES is strictly stronger than DES, even if it might not be 3-times strong in bits) |
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