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I suspect, when the IC was invented, it was typically used together with human judgement, so there might not be any standard rules to address this issue. Anyway, it seems like there are two plausible solutions: It might be easy to add a special case for this situation: choose the keylength with the highest IC, except that if it has a divisor whose IC is ...


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The Hamming distance is more effective when you suspect that the plaintext has been XORed with some repeating keystream. That's because XOR works at a bit level, as does the Hamming distance. The Index of Coincidence is more effective when you suspect that the plaintext has been combined with some repeating keystream, where the combiner works ...



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