Fish (cryptology)
Fish (also written: FISH ) was the Allied code name for encrypted telex connections of the German Wehrmacht during World War II . Mainly three systems were distinguished:
- Tunny (German: " Thunfisch ") - the key addition SZ42 from Lorenz AG , whose messagescould be deciphered in Bletchley Park with the help of the Colossus .
- Sturgeon (German: " Stör ") - the secret writer T52 from Siemens & Halske , which could also be broken , but did not contain many messages.
- Thrasher (German: " Drescher ") - the Siemens T43 teleprinter, which implemented the unbreakable one-time pad method.
Key networks
In addition, there were other fish names that the British codebreaker Bill Tutte (1917–2002) remembered, such as Bream (" Brasse "), Herring (" Hering ") and Mackerel (" Mackerel "). However, these were not independent systems, but the English code names of German radio links used in Bletchley Park (BP), all of which were operated with Tunny (Lorenz key addition). In detail these were:
| Surname | Radio link | |
|---|---|---|
| Bream | Berlin | Rome |
| Herring | Rome | Tunis |
| Jellyfish | Berlin | Paris |
| Grilse | Berlin | La Rochelle |
| Mullet | Berlin | Oslo |
| Turbot | Berlin | Copenhagen |
| Dace | Berlin | Koenigsberg |
| Whiting | Koenigsberg | Riga |
| Perch | Koenigsberg | Belarus |
| Squid | Koenigsberg | Northern Ukraine |
| Octopus | Koenigsberg | Eastern Ukraine |
| Stickleback | Koenigsberg | South Ukraine |
| Smelt | Eastern Ukraine | South Ukraine |
| Grayling | Koenigsberg | Belgrade |
| Tarpon | Berlin | Bucharest |
| Gurnard | Berlin | Belgrade |
| Chubb | Belgrade | Saloniki |
| Flounder | Saloniki | Rhodes |
| Codfish | Berlin | Saloniki |
literature
- James A. Reeds, Whitfield Diffie , JV Field: Breaking Teleprinter Ciphers at Bletchley Park: An edition of I. J. Good , D. Michie and G. Timms: General Report on Tunny with Emphasis on Statistical Methods (1945) . Wiley - IEEE Press, 2015, ISBN 978-0-470-46589-9 .
- Francis Harry Hinsley , Alan Stripp: Codebreakers - The inside story of Bletchley Park . Oxford University Press, Reading, Berkshire 1993, ISBN 0-19-280132-5 .
- Bill Tutte : Fish and I. 1998. PDF; 62 kB. Retrieved January 3, 2017.
- W. Mache: Secret Scribe ( Cryptology: Yesterday, Today and Tomorrow , Artech House, Norwood, 1987)
- C. Deavours, L. Kruh: Mechanics of the German Telecipher Machine (Reprinted as Cryptology: Yesterday, Today and Tomorrow )
Individual evidence
- ^ Bill Tutte: Fish and I. 1998. PDF; 62 kB. Retrieved January 3, 2017.