notes Bibliography This paper was written at the request of TICOM to show how the various German cipher machines could be solved. The authors assume Kerckhoffs's principle and do not address the breaking of the machines, only the solving of keys. A revised and augmented translation of W kręgu enigmy, Warsaw, Książka i Wiedza, 1979, supplemented with appendices by Marian Rejewski Largely an abridgment of , minus Rejewski's appendices, which have been replaced with appendices of varying quality by other authors Manuscript written at Uzès, France Manuscript Appendix B of Appendix C of Appendix D of Appendix E of An early publication containing several misapprehensions that are corrected in an addendum in the 1997 edition. New edition updated with an addendum consisting of a 1986 paper written by Welchman that corrects his misapprehensions in the 1982 edition. This is reproduced as an addendum in the 1997 edition of Welchman's 'The Hut Six Story'. (also National Archives and Records Administration Record Group 457, File 35701.) ASIN: B0006RLRA4 External links Dayton Daily News, Dayton's Code Breakers. Dayton Codebreakers Web site, DaytonCodebreakers.org About the Enigma (National Security Agency) "The Enigma Code Breach" by Jan Bury "Enigma" and Intelligence "The Enigma machine and Bletchley Park", Cybertwists A capsule account of how the Poles and British broke the Army Enigma. "The German cipher machine Enigma", Matematik Sider, 20 September 2014 "The Polish Enigma crackers", Deutsche Welle, 17 February 2015 (an audio report for general audiences) The Breaking of Enigma by the Polish Mathematicians Sir Dermot Turing said that his uncle's achievements in cracking German communications encrypted on the Enigma machines were based on work by a group of Polish mathematicians: Turing cult has obscured role of Polish codebreakers Bletchley Park Enigma machine History of cryptography Signals intelligence of World War II