Tunny

Tunny further He was assigned to the Research Section and set to work on a German teleprinter cipher known as " Tunny ".

After a fruitless period during which Research Section cryptanalysts tried to work out how the Tunny machine worked, this and some other keys were handed to Tutte, who was asked to "see what you can make of these".

As part of an attack on Tunny, Max Newman and his colleagues helped specify the Colossus.

Before the Germans increased the security of their operating procedures, British cryptanalysts diagnosed how the machine functioned and built a machine that emulated it, (" British Tunny ").

The British called encrypted German teleprinter traffic " Fish ",sfn and the unknown machine and its intercepted messages " Tunny ".

The Colossus and Tunny galleries are open daily.

The Lorenz SZ 40/42 machine was used for high-level Army communications, termed "Tunny" by the British.

These cipher systems were cryptanalysed, particularly Tunny, which the British thoroughly penetrated.

The Tunny networks were used for high-level messages between German High Command and field commanders.

This was a teleprinter rotor cipher attachment codenamed Tunny at Bletchley Park.

Tutte knew that the Tunny indicators used 25 letters (excluding J) for 11 of the positions, but only 23 letters for the other.