The ciphertext-only attack is the easiest to defend against.

Question

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In a ciphertext-only attack, the attacker has access only to the ciphertext without any knowledge of the corresponding plaintext or the encryption key. This scenario provides minimal information to the attacker, making it generally easier to defend against compared to other types of attacks where more information (like plaintext or encryption keys) might be available to the attacker.

The Ciphertext-Only Attack Is the Easiest to Defend Against