The ciphertext-only attack is the easiest to defend against because the opponent has the least amount of information to work with.

Question

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In a ciphertext-only attack, the attacker only has access to the ciphertext, making it the scenario where they have the least amount of information about the encryption scheme, keys, or plaintext, thus making it generally easier to defend against compared to other types of attacks where more information might be available to the attacker.

The Ciphertext-Only Attack Is the Easiest to Defend Against Because