ALAN M. TURING'S CRITIQUE OF RUNNING SHORT CRIBS ON THE US NAVY BOMBE

Declassified documents from the “Crane Collection” at the National Archives (USA) reveal much of the cryptanalytical collaboration that defeated the German Naval Enigma machine. As researchers continue to work through these papers, new light is shed on that relationship. In May, 2002 a manuscript, typed and handwritten, by Alan M. Turing was found by the author in the ”Crane Collection”. Written at the time of his United States visit during the winter of 1942–1943, it reflects Government Code and Cypher School (GC&CS) interests and skepticism regarding the US Naval Intelligence (OP-20-G) effort to independently design and construct its own rapid analytical machines (RAMs).