The Siemens and Halske T52, also admit as secret teleprinter, were in 2. World war a German coding machine for Funkfernschreiben (= RTTY). It received the code name Sturgeon from British Kryptologen within the cipher system of stream cipher FISH. Of the T52 between 600 and 1200 units were produced.

While the Enigma was used generally by mobile troop units, the T52 was used in the command units of the Air Force. These operated the heavy and secret writer stationarily. In similar role Lorenz SZ40/42 (the other subsystem of FISH) was used in the army.

One of the advantages consisted of it that the operators of two connected devices with the cryptotext did not come into contact, coding was transparency. It concerned 5 independent binary pseudo-random number generators, which became verXORt with the 5 bits Baudot code (exclusive OR), first with the transmitter then with the receiver.

The machine attained meaning, it in the history of cryptography some for different reasons was only partly decoded. The code of the T52 was decoded independently of Arne Beurling as well as of scientists in the Bletchley park (code names there FISH Sturgeon for T52, FISH Tunny for Lorenz SZ42). There were the among themselves incompatible variants to T52a, T52b, T52c, T52ca and T52d. The variants A and b were kryptologisch weak. T52d however was crucially improved equipment, which did not exhibit the recognized glaring errors of the predecessors any longer, about a small crank handle for resetting the key unit, which led to the fact that a great many krypton oh arranging with the same key were sent away. A clear attenuation of cryptography experienced the system by repeated inappropriate operation also regarding key selection and other reductions of the key area which can be accepted.

Literature

• Frode Weierud: sturgeon - the FISH Bletchley more never really caught

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