BREAKING GERMAN ARMY CIPHERS

ABSTRACT A large number of encrypted German Army radio messages, from 1941 and 1945, have survived the end of the Second World War to the present day. Most of these messages are enciphered on the three-wheel, steckered Wehrmacht Enigma. We present an account of a ciphertext-only cryptanalysis of these messages and give details of the Enigma procedures used in the networks.