Editing Fish (cryptography) (section)

===Tunny===
[[File:Lorenz-SZ42-2.jpg|right|280px|thumbnail|The Lorenz SZ42 machine with its covers removed. [[Bletchley Park]] museum]]
The NoMo1 link was initially named '''Tunny''' (for tunafish), a name which went on to be used both for the [[Lorenz SZ 40|Lorenz SZ40/42]] machines and for the Bletchley Park analogues of them. The NoMo1 link was subsequently renamed Codfish.<ref>{{Harvnb|Gannon|2006|p=170}}</ref> A large number of Tunny links were monitored by the [[Y-stations|Y-station]] at [[Knockholt]] and given names of fish. Most of these were between the ''[[Oberkommando der Wehrmacht]]'' (German High Command, OKW) in Berlin and German army commands throughout occupied Europe. 

The Tunny links were based on two central transmitting and receiving points in [[Strausberg]] near Berlin for Army generals in the West and one in [[Königsberg]] in Prussia for the Eastern Front. The number of radio links jumped from eight in mid-1943 to fourteen or fifteen. In 1941 the initial experimental Tunny link was between Berlin and Athens/Salonoka. 
By D-Day in 1944 there were twenty-six links, based on Konigsberg and Straussberg. Other links were usually mobile; in two trucks, one with radio equipment and one with a "send" Tunny machine and a receive "Tunny" machine. The links carried very high-grade intelligence: messages from Hitler and the High Command  to various Army Group commanders in the field.{{sfn|Erskine|Smith|2001|p=353}}{{sfn|Price|2021|p=136}} 

[[Cryptanalysis of the Lorenz cipher]] at Bletchley Park was assisted initially by a machine called [[Heath Robinson (codebreaking machine)|Heath Robinson]] and later by the [[Colossus computer]]s yielded a great deal of valuable high-level intelligence.

{| class="wikitable" | border=1 | style="margin: 1em auto 1em auto"
|+ Bletchley Park names of Tunny links<ref>{{ Harvnb | Copeland | 2006 | p = 41 }}</ref>
|-
! width="100pt" align="center" | Name
! width="200pt" colspan="2" align="center"  | Between
|-
| Bream  || Berlin  || width="100pt" | Rome
|-
| Herring || Rome  || Tunis
|-
| Jellyfish || Berlin  || Paris
|-
| Grilse || Berlin  || La Roche
|-
| Mullet || Berlin  || Oslo
|-
| Turbot || Berlin  || Copenhagen
|-
| Dace  || Berlin  || Königsberg
|-
| Whiting || Königsberg || Riga
|-
| Perch || Königsberg || Central Belarusse
|-
| Squid || Königsberg || N Ukraine
|-
| Octopus || Königsberg || E Ukraine
|-
| Stickleback || Königsberg || S Ukraine
|-
| Smelt || E Ukraine || S Ukraine
|-
| Grayling || Königsberg || Belgrade
|-
| Tarpon || Berlin || Bucharest
|-
| Gurnard || Berlin || Belgrade
|-
| Chubb || Belgrade || Salonica
|-
| Flounder || Salonika || Rhodes
|-
| Codfish || Berlin || Salonika
|-
|}
Tunny decrypts provided high-grade intelligence in an unprecedented quality. Walter Jacobs, a US Army codebreaker who worked at Bletchley Park, wrote in an official report on the operation to break Tunny that in March 1945 alone 'upward of five million letters of current transmission, containing intelligence of the highest order, were deciphered'.<ref>S. Wylie, Breaking Tunny and the birth of Colossus, ''Action This Day'' (eds. M. Smith and R. Erskine), Bantam Press, London, 2001, pp. 317-341.</ref>