q17-
During the second world war the British intelligence analysts succeeded in breaking the Enigma code by using a short snippet of familiar communication each day. This familiar phrase enabled the day's key to be broken, and the rest of the day's messages were then decrypted using the key. This is known as what kind of cryptographic attack?
A chosen plaintext attack.
A known plaintext attack.
A dictionary attack.
A brute-force attack.
A ciphertext-only attack.
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