Which kind of attack does an attacker use known information in encrypted files to break the encryption scheme for the rest of A. known.plaintext

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1. A.
   When a captured German revealed under interrogation that Enigma
   operators had been instructed to encode numbers by
   spelling them out,
   Alan Turing
   reviewed decrypted messages, and determined that the
   number “
   eins
   ” (“1”) appeared in 90% of messages. He automated the crib
   process, creating the Eins
   Catalogue, which assumed that “
   eins
   ” was
   encoded at all positions in the plaintext. The catalogue included every
   possible position of the various rotors, starting positions, and keysettings
   of the Enigma.

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