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Fish (sometimes '''FISH''') was the Allied codename for any of several German Teleprinter Stream Cipher s used during World War II . While a large number of links were monitored, at least three different encryption systems were distinguished:

  • '' Tunny '' — the Lorenz SZ 40 and SZ 42 from Lorenz Electric. Tunny traffic was read successfully at Bletchley Park , using the famous Colossus Computer .

  • '' 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


REFERENCES

  • 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)