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Which of these cryptanalytic attacks is the toughest for the cryptanalyst?
Known plaintext
None of these
Cipher text only
Chosen plaintext
Because attacker has the sample of cypher text only. In other listed attacks attacker has the sample of both plaintext and cipher text. https://crypto.stackexchange.com/questions/55861/whats-the-difference-between-a-known-plaintext-attack-and-a-ciphertext-only-att
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