Cryptography bell ernest l (1 risultati)

First Edition. No statement of printing or edition. Inscribed illegibly on title page, signed by the author (undated). Quarto (28cm). Side-stapled sheets; printed from typescript; 110pp. Fine. An attempt to reconstruct the history and chronology of the tactical use of "Ultra" - the top-secret decryption technique pionered at Bletchley Park in England - by American forces in WW2. At the time this work was assembled, all government documents on Ultra remained classified; Bell, through a mult-year effort, was able to obtain three pertinent reports Freedom of Information Act; they are reproduced, with redactions, here: George C. Marshall's Order of March 15, 1944; "Synthesis of Experiences in the Use of Ultra Intelligence by U.S. Army Field Commands" (1944); and "Use of CX/MSS Ultra by the United States War Department" (1945). Self-published, and uncommon. Signed.…