Breaking Teleprinter Ciphers at Bletchley Park: An edition by James A. Reeds, Whitfield Diffie, J. V. Field

By James A. Reeds, Whitfield Diffie, J. V. Field

This e-book is an version of the General record on Tunny with observation that clarifies the usually tricky language of the GRT and becoming it right into a number of contexts coming up out of numerous separate yet intersecting tale strains, a few in basic terms implicit within the GRT. 

  • Explores the most probably roots of the information getting into the Tunny cryptanalysis
  • Includes examples of unique worksheets, and printouts of the Tunny-breaking method in action
  • Presents extra observation, biographies, glossaries, essays, and bibliographies

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Read or Download Breaking Teleprinter Ciphers at Bletchley Park: An edition of I.J. Good, D. Michie and G. Timms: General Report on Tunny with Emphasis on Statistical Methods PDF

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Additional resources for Breaking Teleprinter Ciphers at Bletchley Park: An edition of I.J. Good, D. Michie and G. Timms: General Report on Tunny with Emphasis on Statistical Methods

Example text

It was powerful but slow. Moreover, the cryptanalysts were looking for small effects, so the counting had to be done accurately. In this kind of procedure, omitting a letter can as it were push the cycles out of phase, making the pattern more difficult to see. As they put it in their Report: The standard of accuracy needed before there was any possibility of success was very much higher than would ordinarily be required of this kind of apparatus, or of operators. A single letter omitted in a tape destroyed the value of the run and the ordinary length of a tape was about 3000 letters.

To get an accurate ‘fix’ on the position of a distant transmitting station, the angle between the lines of sight to it from the two interception stations must be as large as possible, which means that the interception stations must be widely separated. The British interception service (called the ‘Y’ service) made use of stations scattered across the length and breath of the island: such as Capel le Ferne (in Kent, between Dover and Folkestone) (H. C. 7, TNA HW 50/79, p. 2; this edition App. B, pp.

It arrived at Bletchley Park in June and acquired the name ‘Heath Robinson’ after the complicated mechanical contraptions depicted by the then well known cartoonist Heath Robinson (1872–1944). It seems that the names of machines were generally invented by the women who operated them (personnel of the WRNS, usually known as Wrens). In this case, the British habit of using only surnames led to the name becoming ‘Robinson’. Later models were called Old Robinson and Super Rob. The Robinson machines (by the end of hostilities there were three of them in operation) were designed to carry out some of the more laborious procedures involved in the breaking of Tunny traffic.

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