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An attacker was questioned about the attack vector he used to decrypt an encrypted data file, and he confessed that he analyzed the messages based on encrypted message length. Which cipher was he trying to attack here?
Stream
Block
None of these
Symmetric
Stream ciphers do not modify the length of encrypted message. When a fixed-length message (such as data file) is encrypted with a stream cipher, an attacker can attempt to attack the cipher based on the length of the encrypted message.
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