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 (1945) /

• Other Authors: Reeds, James A. (Editor), Diffie, Whitfield (Editor), Field, J. V. (Editor)
• Format: eBook
• Language: English
• Published: [Piscataway, NJ] : Hoboken, New Jersey : IEEE Press ; Wiley, [2015]
• Subjects: World War (1939-1945); 1900-1999; Cryptography > Great Britain > History > 20th century.; World War, 1939-1945 > Electronic intelligence > Great Britain.; HISTORY / Europe / Western; Cryptography > Germany > History.; Cryptography > Great Britain > History.; Lorenz cipher system.; World War, 1939-1945 > Cryptography.; World War, 1939-1945 > Electronic intelligence > Great Britain.; Cryptography.; Electronic intelligence.; Bletchley Park (Milton Keynes, England) > History > 20th century.; England > Milton Keynes > Bletchley Park.; Great Britain.; Electronic books.; History.

This book is an edition of the General Report on Tunny with commentary that clarifies the often difficult language of the GRT and fitting it into a variety of contexts arising out of several separate but intersecting story lines, some only implicit in the GRT. Explores the likely roots of the ideas...

Table of Contents:

• BREAKING TELEPRINTER CIPHERS AT BLETCHLEY PARK; Contents; Preface; Editorial Notes; Notes on Vocabulary; List of Abbreviations; Cryptanalytic Significance of the Analysis of Tunny, by Whitfield Diffie; Editors' Introduction, by Whitfield Diffie and J. V. Field; Statistics at Bletchley Park, by S. L. Zabell; Biographies of Authors; Notes on the Editors of the Present Volume; List of Figures; General Report on Tunny, with emphasis on statistical methods; 01 Preface; Part 1: Introduction; Chapter 11: German Tunny; 11A: Fish machines; 11B: The Tunny cipher machine; 11C: Wheel patterns
• 11D: How Tunny is used11E: The Tunny network; Chapter 12: Cryptographic Aspects; 12A: The problem; 12B: Modern strategy; 12C: Chi breaking and setting: Solution of Z = X+D; 12D: Motor and psi breaking and setting: Solution of D = P+; 12E: Methods involving key: Solution of Z = K+P, and K = X+; Chapter 13: Machines; 13A: Explanation of the categories; 13B: Counting and stepping machines; 13C: Copying machines; 13D: Miscellaneous simple machines; Chapter 14: Organisation; 14A: Expansion and growth; 14B: The two sections in 1945; 14C: Circulation; Chapter 15: Some Historical Notes
• 15A: First stages in machine development15B: Early organisation and difficulties; 15C: Period of expansion; Chapter 21: Some Probability Techniques; Chapter 22: Statistical Foundations; 22A: Introductory; 22B: The chi-stream; 22C: The motor stream; 22D: The psi stream; 22E: The sum of two streams; 22F: The key stream; 22G: The plain language stream; 22H: The de-chi stream; 22J: The cipher stream; 22K: Sampling errors in alphabetical counts; 22W: Some further streams; 22X: The algebra of proportional bulges; 22Y: The amount of evidence derived from a letter count; Chapter 23: Machine Setting
• 24E: Rectangle significance tests24F: Conditional rectangle; 24G: Some generalized rectangles; 24W: Theory of convergence; 24X: Significance tests; 24Y: Other theory of rectangles; Chapter 25: Chi-Breaking from Cipher; 25A: The short wheel-breaking run; 25B: Weighing the evidence; 25C: General plan of wheel-breaking; 25D: Particular methods; 25E: Special methods for 2 limitation; 25F: Special method for ab 1/2; 25G: Wheel-breaking exhibits; 25W: Derivation of formulae for the weighing of evidence; 25X: The number of legal wheels; 25Y: Proportional bulges relating to X2