Breaking Japanese Diplomatic Codes: David Sissons and D Special Section During the Second World War

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Desmond Ball, Keiko Tamura
ANU E Press, Sep 1, 2013 - History - 204 pages
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During the Second World War, Australia maintained a super-secret organisation, the Diplomatic (or `D’) Special Section, dedicated to breaking Japanese diplomatic codes. The Section has remained officially secret as successive Australian Governments have consistently refused to admit that Australia ever intercepted diplomatic communications, even in war-time. This book recounts the history of the Special Section and describes its code-breaking activities. It was a small but very select organisation, whose `technical’ members came from the worlds of Classics and Mathematics. It concentrated on lower-grade Japanese diplomatic codes and cyphers, such as J-19 (FUJI), LA and GEAM. However, towards the end of the war it also worked on some Soviet messages, evidently contributing to the effort to track down intelligence leakages from Australia to the Soviet Union.
 

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Contents

David Sissons and D Special Section
1
Cryptographic
53
Interviews Correspondence and Notes
103
Notes from an Interview with with Professor Arthur
115
Ian Smith to David Sissons 8 August 1990
125
Interview of Dr A P Treweek by David Sissons
131
David Sissons to Desmond Ball 11 October 1993
143
Steve Mason to Desmond Ball 7 July 1995
149
David Sissons to Desmond Ball 22 May 1996
157
David Sissons to Desmond Ball 9 September 1996
163
David Sissons to Kenneth McKay 9 November 2004
169
Notes on the Breaking of GEAM Using
175
David Sissons to Kenneth McKay 28 November 2004
185
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