 This technique is termed a "known plaintext attack" and had been used to a limited extent by the Poles, e.g., the Germans' use of "ANX" — German for "To," followed by "X" as a spacer.As chief engineer at the British Tabulating Machine Company at Letchworth Keen was approached to turn these ideas into a working reality.The first bombe, which was based on Turing's original design, was installed in Hut 1 at Bletchley Park on 18 March 1940 and was named "Victory".