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The Riverbank Publications: The Index of Coincidence and Its Applications in Cryptography, Publication Number 22 Paperback – Nov 1998

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Product Details

  • Paperback: 87 pages
  • Publisher: Aegean Park Pr (November 1998)
  • Language: English
  • ISBN-10: 0894120344
  • ISBN-13: 978-0894120343
  • Product Dimensions: 1.3 x 21 x 26.7 cm
  • Shipping Weight: 272 g
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2 of 2 people found the following review helpful
classic introduction, now somewhat dated Oct. 2 2000
By Ray Dillinger - Published on
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William F. Freidman was perhaps the greatest cryptological mind the world has ever produced. The Riverbank Publications were his textbooks when he was teaching american servicemen cryptanalysis in 1917. It was early in his career, and these books dealt mainly with nomenclators, "trench codes" and classical cryptographic systems such as the Playfair cipher and the Vigenere cipher, and "running key" or "book" systems.
Friedman broke new cryptanalytic ground with all of these systems, coming up with new attacks and utterly demolishing the Vigenere, which was at that time considered "unbreakable". He hadn't yet developed the science to the level he brought it to by World War II later in his career, but this is a valuable insight on the way his mind worked, and some of the earliest writing on the subject that he did.
In the first run, the works were printed in 8 small volumes -- but since the material was highly classified at that time, the printing run was only 400 issues.
After the army used them in their cryptanalysis course, they ascended into the heights of "rare-book heaven", and collectors and dealers trying to lay hands on one would move heaven and earth to get it.
I was very pleased to see that someone finally managed to get permission to reprint these volumes -- albeit in a different format and in only 3 volumes. Now at last I can own copies of this piece of cryptological history.