The Sturgeon, another so-called "fish" cipher, was primarily used by the German Air Force, according to the NSA. It was capable of high-speed teleprinter transmissions. This particular machine used cable rather than radio to transmit its messages, thus decreasing the allies' ability to intercept.
Swedish mathematician Arne Beurling was the first to decipher and reverse-engineer the Sturgeon (also known as the Geheimfernschreiber and as the Siemens and Halske T52), a feat he accomplished in just two weeks. He later became a Princeton University professor.
Credit: National Security Agency
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