The Commercial Enigma: Beginnings of Machine Cryptography. The Significance of Codebreaking and Intelligence in Allied Strategy and Tactics. British-American Cryptanalytic Cooperation and an Unprecedented Admission by Winston Churchill. An Enigma Chronology. The First Naval Enigma Decryptos of World War II. The Road to German Diplomatic Ciphers-1941 - 1945. A Conversation with Marian Rejewski. Roosevelt, Churchill, and Me. The Geheimschreiber.
A brief history and description of the first four models of the Enigma cipher machine, designed for the commercial market, taken in part from the authors' book [1].
This is a collection of articles and professional papers from Cryptologia, a journal which focuses on the history and technology of cryptology. The volume offers personal accounts of crypto personalities, scholarly papers on the origins of cryptology, the inadequacy of cryptanalysis, and much more. Articles from Historica include: the unsolved messages of Pearl Harbor; Roosevelt, MAGIC and ULTRA; and diplomatic cryptanalysis in World War II. Articles from Technologia include: Viet Cong SIGINT and US army COMSEC in Vietnam; a World War II German radio army field cipher and how it was broken; and information on the history of the Siemens and Halske T52 cipher machines.
A variant of the Enigma cryptograph used by the Abwehr (German secret police) before and during WWII is discussed along with several cryptanalytic weaknesses exhibited by the machine.
In the latter part of WWII, the Army Signal Security Agency built several machines known as Scritchers. These machines mechanized the solution of a variant of the German Enigma cipher machine having a rewirable reflecting rotor. This article discusses the probable method by which the machines worked.
The effectiveness of Alan Turing's original bombe design is discussed in this article along with organizational methods of implementing it via a microcomputer. To illustrate the material presented, a three part German Werhmacht message is solved.
John F. Byrne invented Chaocipher in 1918 and tried unsuccessfully for almost 40 years to interest the U.S. government in his cipher system. He offered a reward to anyone who could break his cipher but the reward was never claimed. In 1989, John Byrne, son of John F. Byrne, demonstrated Chaocipher to two Cryptologia editors to determine if it had any commercial value. After making some improvements and providing additional information they jointly issue a new challenge to would-be solvers.
The solution of a Hagelin C-35 message where 3 of the 5 rotors have the same starting position is illustrated.
Discussion of a cipher system used by the Ku Klux Klan during the 1920's
