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A cyphertext-only attack is a form of cryptographic attack in which the attacker possesses only the encrypted message, with no corresponding plain text or segment of the key to work with.
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Is knowing the distribution of input domain only way to do cipher text only attacks?
Since for any fixed key the encryption algorithm is a bijection from the set of $n$-bit strings onto itself, the set of all possible ciphertexts is regardless of the key and algorithm always the set o …