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Manual for the Solution of Military Ciphers

Chapter 29: Encoding
By Parker Hitt
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About This Book

The manual provides practical instruction on the construction, operation, and cryptanalysis of military ciphers, stressing that secrecy requires enciphering entire communications, including headers. It sets out desirable system requirements and examines common cipher classes, their typical weaknesses, and tactical trade-offs between security and usability. Procedures for systematic analysis—frequency tables, rearrangement, pattern fitting—and the equipment and routines for a cipher office are explained step by step. The text emphasizes that no readily usable cipher is absolutely unbreakable, that short messages are particularly troublesome, and that successful work depends on perseverance, methodical technique, and applied intuition.

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This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org.

This eBook is produced by the Online Distributed Proofreading Team at www.pgdp.net.

Scans for this book are available from the Internet Archive (copy 1).

Library of Congress Classification: UB290 .H5.

Related Library of Congress catalog page: war16000058.

Related Open Library catalog page (for source): OL7044123M.

Related Open Library catalog page (for work): OL92027W.

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Revision History

  • 2011-12-15 Started.

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Corrections

The following corrections have been applied to the text:

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