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Analysis of individual security aspects of a cipher or algorithm, not the security of a cipher or algorithm in general (which would lean towards “algorithm-design”).

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How would one crack a weak but unknown encryption protocol?

It depends on what information you have. If all you have is that one ciphertext and no way of acquiring more, there's not much you can do. If you have multiple ciphertexts, you can try to observe any …
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4 votes

Using Chi-Square for Vigenère Cipher

This method isn't deterministic. That is, just because a keyword has the lowest chi-square value, that doesn't mean it's the keyword. All it means that there is a good chance that it is the keyword. I …
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