Manual For The Solution Of Military Ciphers

by Parker Hitt

A manual for breaking military ciphers. Also contains instruction in how to organise the work, what makes a good military cipher and statistics for English letters, bigrams and trigrams, Spanish letters frequencies and bigrams. And also letters frequencies in French, German, Italian and Portuguese.

Instructions for identifying the class of chipher and how to examine them

Content:
Introduction
Chapter I Equipment for Cipher Work
Chapter II Principles of Mechanism of a Written Language
Chapter III Technique of Cipher Examination
Chapter IV Classes of Ciphers
Chapter V Examination of Transposition Ciphers
Chapter VI Examination of Substitution Ciphers
Chapter VII
Chapter VIII
Chapter IX Other Substitution Methods
Chapter X Errors in Enciphering and Transmission

Notice that the book is from 1917. These codes are not safe any more for professionel use.

The book is available on Project Gutenberg:
http://www.gutenberg.org/ebooks/48871

108 pages, Paperback

First published January 1, 1916

About the author

American Officer and Cryptologist

Reviews

[J_BlueFlower · Rating 3 out of 5]

Military ciphers in 1917. Now, hundred years letter they are on the level of advanced children's games.

A practical little book with good examples.