Fish (cryptography)

Fish (sometimes '''FISH''') was the Allied codename for any of several German Teleprinter Stream Cipher s used during World War II Wolfgang W. Mache, ''Geheimschreiber'' (''Cryptology: Yesterday, Today and Tomorrow'', Artech House, Norwood, 1987)Cipher A. Deavours and Louis Kruh, ''Mechanics of the German Telecipher Machine'' (also reprinted in ''Cryptology: Yesterday, Today and Tomorrow'')Wolfgang W. Mache, ''The Siemens Cipher Teletype in the History of Telecommunications'' (reprinted in ''Selections from Cryptologia: History, People, and Technology'', Artech House, Norwood, 1998). While a large number of links were monitored, at least three different encryption systems were distinguished:

'' Intercept Station, the recording of those signals, the identification of the type of codes in use, the breaking of the codes using advanced statistical and cryptographic techniques, the development of mechanical, electro-mechanical and electronic machines (including the development of Colossus Computer ) to aid the decryption and an appreciation of the value of the intelligence gained.

'' Sturgeon '' — the '' Siemens And Halske T52 '' from Siemens . Although Bletchley Park managed to work out Sturgeon, they never read much of its traffic.

''Thrasher'' — probably the Siemens T43 one-time tape machine. The T43 was used only on a few circuits, in the later stages of the war.

''See also:'' Ultra

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Fish (cryptography)