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Download Colossus: The Secrets of Bletchley Park's Codebreaking by B. Jack Copeland, Jack Copeland PDF

By B. Jack Copeland, Jack Copeland

Ultimately - the secrets and techniques of Bletchley Park's strong codebreaking computers.

This is a background of Colossus, the world's first fully-functioning digital electronic computing device. Colossus used to be used throughout the moment global struggle on the govt Code and Cypher university at Bletchley Park, the place it performed a useful function cracking enemy codes. till very lately, a lot in regards to the Colossus laptop was once shrouded in secrecy, mostly as the codes that have been hired remained in use via the British safety prone until eventually a little while in the past. This e-book merely turned attainable as a result of the
declassification within the US of wartime documents.

With an introductory essay on cryptography and the heritage of code-breaking through Simon Singh, this ebook finds the workings of Colossus and the extreme employees at Bletchley Park via own debts by means of those that lived and labored with the pc. between them is the testimony of Thomas plants, who used to be the architect of Colossus and whose own account, written presently prior to he died, is released the following for the 1st time. different essays ponder the historic significance of this
remarkable desktop, and its influence at the generations of computing know-how that undefined.

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Extra info for Colossus: The Secrets of Bletchley Park's Codebreaking Computers (Popular Science)

Example text

The history of cryptography is a battle between codemakers and codebreakers. Each time a code is broken, a new one has to be developed. Codes and ciphers evolve under the pressure exerted by codebreakers. Technology can accelerate this evolution, as both codemakers and codebreakers can develop devices to make and break codes. Technology is doubly important, because new communication systems, such as telegraph and radio, demand greater security and increase pressure on the codemakers. ENIGMA, THE MECHANICAL VIGENÈRE CIPHER As soon as the First World War ended, the German inventor Arthur Scherbius patented one of the most notorious cipher machines in history, the Enigma (see photographs 18–19 and 24).

The Steckerbrett (Stecker = ‘plug’, brett = ‘board’) was an old-fashioned telephone-style plugboard, which allowed the operator to introduce an additional encipherment, using cables and jacks to connect pairs of letters: ‘B’ to ‘Z’, ‘V’ to ‘L’, etc. (see the diagram on page 17). This made the machine very much more secure, increasing the variations of encipherment to 159 million million million possible settings and blocking British attempts to read the Wehrmacht systems for around eight years.

This was clearly no longer sufficient and teleprinters allowing direct contact with MI6 were put into Hut 3. The staff of Hut 3 was expanded rapidly by borrowing people who spoke German from other huts and by recruiting others from the universities. Each watch consisted of four intelligence officers, a Watch No. 1 and three others, together with a number of typists and clerical assistants. ‘Hut 3 and Hut 6 were side by side,’ said Ralph Bennett, one of the watch intelligence reporters. ’ In order to keep the number of people aware that the German ciphers had been broken to a minimum, Hut 3 totally rewrote the messages to remove any evidence of a deciphered radio signal.

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