The breaking of the Lorenz Cipher: An introduction to the theory behind the operational role of 'Colossus' at BP

Autor:	F. L. Carter
Rok vydání:	1997
Předmět:	Colossus computer business.industry Computer science Plain text Cryptography computer.file_format Morse code law.invention Character (mathematics) Cipher law Lorenz cipher Code (cryptography) Artificial intelligence Arithmetic business computer
Zdroj:	Crytography and Coding ISBN: 9783540639275 IMA Int. Conf.
Popis:	The Lorenz Cipher Machine provided a means of communication which was used exclusively by the German Army High Command during the second world war. At Bletchley Park the cipher traffic generated by this machine, was called "Fish", and the different radio communication links used were given appropriate names e.g. "Tunny", "Bream", "Tarpon" etc. These cipher messages consisted of sequences of characters based on the International Teleprinter code. The transmissions were not made in Morse, but used a carrier wave modulated by six audio frequency tones, three for each of the two basic symbols used; these two basic symbols were referred to as "cross" and "dot" at Bletchley. In the teleprinter code, each character is represented by a sequence of five of these basic symbols, so that in all, the system provides for a total of thirty two distinct characters. Twenty six of these are used to represent the standard letters of the alphabet, and five for the "control characters".
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7d275985feb80a8f2ab012be6a99ce86 https://doi.org/10.1007/bfb0024451 Zobrazit plný text záznamu