The Geheimschreiber Secret
Arne Beurling and the success of Swedish signals intelligence

Lars Ulfving

Translated from the Swedish by Frode Weierud

Original Title: ``Geheimschreiberns hemlighet, Arne Beurling och den svenska signalspaningens framgångar''
In ``I Orkanens Öga, 1941 - Osäker neutralitet''
edited by Bo Hugemark, Probus Förlag, Stockholm 1992

Copyright Notice.

All rights reserved. No part of this document may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, without the prior permission in writing of the original author and the translator. Exceptions are allowed in respect of any fair dealing for the purpose of research or private study, or criticism and review, as permitted under normal copyright law.

Version: 29 January 1997.

 
• Translator's Preface
• A short historical résumé until spring 1941
• Swedish signals intelligence and intelligence service
  before and during the Second World War
• Breaking of the German encrypted telex traffic -
  the breaking of the Geheimschreiber
  • A note about teleprinters
  • Teleprinter encryption
  • The Geheimschreiber
  • Arne Beurling
  • The reconstruction
  • Imperfections, errors and laziness
  • Interception and preparation
• On the eve of Operation Barbarossa:
  How was the intelligence used?
• What happened later?
  When and how was the unique source exposed?
• Experiences and lessons
• Conclusion
• Bibliography
• Translator's Notes
• Translator's Bibliography
• Appendix A
• About this document ...