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Think about what properties of the plaintext are preserved by the candidate ciphers. You want to look for those patterns. Transposition moves letters around but keeps their identity. Substituting keeps positioning but changes identity. So, you can do a test for whether letter identity is preserved. The easiest is to do a frequency analysis: if your ...


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One method is to simply try and break it. If you get an answer by analyzing the ciphertext assuming it is from one method then you can disregard the other one, especially if you have a large ciphertext such as 10,000 letters. Trying both methods only doubles the cost to the adversary after all. As breaking a classical/simple transposition or substitution ...


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