The Alexander Papers

All the papers on this page are covered by Crown Copyright. The authorisation to publish is for this Web Server ONLY. Therefore do NOT publish these papers elsewhere, or you will be in breach of Crown Copyright Rules and Regulations. Please see below for the Copyright details.

Copyright Terms

The Applicant shall ensure that the source of the Material and the originating government department or agency are acknowledged within the Website. The Applicant shall also arrange for the following acknowledgement to be featured in the Website.

“Crown copyright is reproduced with the permission of the Controller of Her Majesty’s Stationery Office.”

PERMITTED USES: This material may be accessed and downloaded onto electronic, magnetic, optical or similar storage media, provided that such activities are for private research, study or in-house use only.

RESTRICTED USES: This material must not be copied, distributed, published or sold without the permission of the Controller of the HMSO.

• HMSO Permission (Adobe PDF Format)

Documents written by the late Conel Hugh O’Donel Alexander while working as a cryptanalyst at Bletchley Park.

DOCUMENT FORMATS:
The documents are written in the Letter format such as to give good printed copies on American size paper. This format also allows one to print perfect copies on A4 paper.

The documents are made available in two different formats, Adobe’s Acrobat PDF and, for those who prefer Postscript, a ZIP archive with the Postscript version is available for download.

• Dud-Busting
• Stecker Knock-Out
  (Procedure for finding the wiring of the pluggable Umkehrwalze D)
• Method for Testing `Holmes Hypothesis’ for U.D.
• Further Note on Holmes Hypothesis
• Hand Duenna
  (Procedure for finding the wiring of the pluggable Umkehrwalze D)
• JNA-20: An Alternative I.C. Plate Attack
• A Method for Breaking Into JNA 20 Traffic

Back to Frode’s CryptoCellar

Site visitors: