Zodiackillersite.com

Hello
I started researching about available cryptographic books in English that was published in 1969 or before and Z could have had access to since it seems like a reasonable place to start looking for cipher construction clues and ideas for countermeasures to frequency analysis.
That is, books that describe cipher systems in order to educate the reader. Books about cipher/war history is of no interest here.

So I was wondering if someone already had looked into this and could share their findings?

So far I have found the following:

Cryptography (André Langie)
Translated from French by J.C.H. Macbeth
Printings: 1922

Codes and Ciphers (Alexander D'Agapeyeff)
Printings: 1932, 1939, 1949
https://www.amazon.com/Codes-Ciphers-Cr ... 1406798584

Secret Writing (David Kemp)
Printings: 1936

The Military Cipher of Commandant Bazeries (Rosario Candela)
Printings: 1938
https://www.amazon.com/military-cipher- ... B00085DA0O

Secret and Urgent - The Story of Codes and Ciphers (Fletcher Pratt)
Printings: 1939, 1942
https://www.goodreads.com/work/editions ... es-ciphers

Cryptanalysis - A study of ciphers and their solution (Helen Fouché Gaines)
(formely published under the title Elementary Cryptoanalysis in 1939)
Printings: 1939, 1941, 1942, 1943, 1944, 1956.
Library of Congress catalog card number: 57-203
https://isbnsearch.org/isbn/0486200973

Elementary Cryptography and Cryptanalysis (Donald Millikin)
Printings: 1943
https://www.goodreads.com/book/show/382 ... ptanalysis

A First Course in Cryptoanalysis (Jack M. Wolfe)
Printings: 1943
https://books.google.com/books/about/A_ ... lvngEACAAJ

Cryptography - The Science of Secret Writing (Laurence D. Smith)
Printings: 1943, 1955
https://www.amazon.com/Cryptography-Sci ... 048620247X

Secret code book; for boys and girls (Frances W. Keene)
Printings: 1950 (3rd edition)
https://www.amazon.com/Secret-code-book ... B0007DRB16

The first book of codes and ciphers (Samuel Epstein)
Printings: 1956
Library of Congress catalog card number: 56-9134
https://isbnsearch.org/isbn/9780531005026

Codes and Ciphers - Secret Writing Through the Ages (John Laffin)
Printings: 1964
https://isbnsearch.org/isbn/9780200015769

Elementary Cryptoanalysis - A mathematical approach (Abraham Sinkov)
Printings: 1964, 1968
https://www.amazon.com/Elementary-Crypt ... B00H2THQ6S

EDIT: removed The Codebreakers (David Kahn, 1967)

Hi borkky. I really like your widget, and being able to cast the 340 into 19 columns.

See here for another list of books:

viewtopic.php?f=81&t=2702

I live in a Mid West college town with a huge university. One day I went to the library and pulled all of the older cryptography books off of the shelf into a big pile. I turned the pages through all of them looking to see what Zodiac may have been influenced by. I saw a lot of hand drawn pictures showing route transposition and various geometric shapes. Discussion of nulls, and transposition of more than one symbol at a time. Also keyed columnar transposition, and all different kinds of substitution and some examples of combined transposition / substitution. I didn't find any examples of combined route transposition / homophonic substitution. Reading through the books gave me a lot of ideas though.

Thank you for your efforts. I will take a look at your books.

Thank you smokie! I'll look trough that list since it has additional books.