Author: Jennifer E. Wilcox
Publisher:
ISBN:
Category : Enigma cipher system
Languages : en
Pages : 55

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Author: Jennifer Wilcox
Publisher: CreateSpace
ISBN: 9781478385783
Category :
Languages : en
Pages : 58

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Book Description
As the German military grew in the late 1920s, it began looking for a better way to secure its communications. It found the answer in a new cryptographic machine called "Enigma." The Germans believe the encryption generated by the machine to be unbreakable. With a theoretical number of ciphering possibilities of 3 x 10114 their belief was not unjustified. However, they never reached that theoretical level of security. Nor did they count on the cryptanalytic abilities of their adversaries. This publication provides a history of this cryptanalytic bombe.

Author: United States. Department of Defense
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: National Security Agency (NSA)
Publisher:
ISBN: 9781521158630
Category :
Languages : en
Pages : 67

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This important NSA publication tells the exciting story of the German Enigma cryptographic machine and the heroic work to read Enigma messages. Some historians claim that World War II could have gone on for as much as two more years, with an untold loss of life, had it not been for the Allies' ability to read Enigma messages. Those messages could not have been read without the Bombes and the men and women who built and operated them. As the German military grew in the late 1920s, it began looking for a better way to secure its communications. It found the answer in a new cryptographic machine called "Enigma." The Germans believed the encryption generated by the machine to be unbreakable. With a theoretical number of ciphering possibilities of 3 X 10114, their belief was not unjustified.1 However, they never reached that theoretical level of security. Nor did they count on the cryptanalytic abilities of their adversaries. The Enigma machine based its cipher capabilities on a series of wired rotor wheels and a plugboard. Through a web of internal wiring, each of the twenty-six input contacts on the rotor were connected to a different output contact. The wiring connections of one rotor differed from the connections on any other rotor. Additionally, each rotor had a moveable placement notch found on an outer ring. The notch forced the rotor to its left to step one place forward. This notch could be moved to a different point on the rotor by rotating the outer ring. The Germans followed a daily list, known as a key list, to indicate where the notch should be placed each day. Another complication to the machine involved the plugboard, which the Germans called a "Stecker." The plugboard simply connected one letter to a different letter. This also meant that the second letter automatically connected back to the first. Again, the key list indicated which letters should be connected for that day. Each day, the Germans followed the key list to plug the plugboard connections, select the rotors to be placed in the machine, change the rotor notch placement, and place the rotors in the left, center, or right position within the machine. Finally, the code clerk chose which three letters were to appear through three small windows next to the rotors. These letters indicated the initial rotor settings for any given message, and the code clerk changed those settings with every message he sent.

Author:
Publisher: PediaPress
ISBN:
Category :
Languages : en
Pages : 557

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Author: Richard Klima
Publisher: CRC Press
ISBN: 1351692534
Category : Computers
Languages : en
Pages : 372

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Book Description
Cryptology: Classical and Modern, Second Edition proficiently introduces readers to the fascinating field of cryptology. The book covers classical methods including substitution, transposition, Playfair, ADFGVX, Alberti, Vigene re, and Hill ciphers. It also includes coverage of the Enigma machine, Turing bombe, and Navajo code. Additionally, the book presents modern methods like RSA, ElGamal, and stream ciphers, as well as the Diffie-Hellman key exchange and Advanced Encryption Standard. When possible, the book details methods for breaking both classical and modern methods. The new edition expands upon the material from the first edition which was oriented for students in non-technical fields. At the same time, the second edition supplements this material with new content that serves students in more technical fields as well. Thus, the second edition can be fully utilized by both technical and non-technical students at all levels of study. The authors include a wealth of material for a one-semester cryptology course, and research exercises that can be used for supplemental projects. Hints and answers to selected exercises are found at the end of the book.

Author: David Mowry
Publisher: CreateSpace
ISBN: 9781478385639
Category :
Languages : en
Pages : 34

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Book Description
Along with breaking the Japanese diplomatic cryptosystem, usually referred to as "PURPLE," probably the greatest example of Allied cryptanalytic success in World War II was breaking of the German Enigma machine. This cryptodevice was used by all of the German armed forces as the primary cryptosystem for all units below Army level or the equivalent. As D-Day approached, other German cryptodevices, the SZ-42 and the various T-52 machines, assumed great importance since they were used by the higher commands of the German armed forces. Many references to these German machines in the histories fail to provide information on what they looked like or how they worked. Another group of cryptodevices, those invented by Fritz Menzer for the Abwehr (Counterintelligence), have received little or no notice in the literature and are unknown to the public. This brochure is an attempt to remedy both lacks.

Author: David W. Packard
Publisher: Univ of California Press
ISBN: 0520332075
Category : Language Arts & Disciplines
Languages : en
Pages : 338

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Author: G. Stuart Smith
Publisher: McFarland
ISBN: 147666918X
Category : History
Languages : en
Pages : 241

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Protesters called it an act of war when the U.S. Coast Guard sank a Canadian-flagged vessel in the Gulf of Mexico in 1929. It took a cool-headed codebreaker solving a "trunk-full" of smugglers' encrypted messages to get Uncle Sam out of the mess: Elizebeth Smith Friedman's groundbreaking work helped prove the boat was owned by American gangsters. This book traces the career of a legendary U.S. law enforcement agent, from her work for the Allies during World War I through Prohibition, when she faced danger from mobsters while testifying in high profile trials. Friedman founded the cryptanalysis unit that provided evidence against American rum runners and Chinese drug smugglers. During World War II, her decryptions brought a Japanese spy to justice and her Coast Guard unit solved the Enigma ciphers of German spies. Friedman's "all source intelligence" model is still used by law enforcement and counterterrorism agencies against 21st century threats.

Author: Jan Slimming
Publisher: Pen and Sword Military
ISBN: 1526784165
Category : Biography & Autobiography
Languages : en
Pages : 370

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The tale of a college student’s top-secret life: “A welcome addition to the seldom told story of the role of American women in [WWII] codebreaking.” —The Spectrum Monitor The Secret Life of an American Codebreaker is the true account of Janice Martin, a college student recruited to the military in 1943 after she was secretly approached by a professor at Goucher College, a liberal arts establishment for women in Baltimore, Maryland. Destined for a teaching career, Janice became a prestigious professor of classics at Georgia State University, but how did she spend three years of her secret life during the war working in Washington D.C.’s Top Secret Intelligence? Why was she chosen? How was she chosen? What did she do? This intriguing biography also delves into the stories of several other World War II codebreakers, male and female. With extensive research, unpublished photographs, and recorded interviews, we discover the life of Janice Martin from Baltimore and her Top Secret Ultra role in helping to combat U-boats in the Battle of the Atlantic, work she and her colleagues undertook in a foundation provided by both British and American intelligence. From the early days to D-Day and beyond, the book reveals the hidden figures who were part of this incredible time in history.