Fish cryptography

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For the (FIbonacci SHrinking) stream cipher published in 1993, see FISH (cipher).

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

See also: Ultra


  • 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)

fr:Poisson (Cryptographie)