Code (cryptography) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Code (cryptography)" in English language version.

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governmentattic.org

A History of U.S. Communications Security; the David G. Boak Lectures Archived 2016-09-18 at the Wayback Machine, National Security Agency (NSA), Volumes I, 1973, Volumes II 1981, partially released 2008, additional portions declassified October 14, 2015

"16.2: Substitution Ciphers". Mathematics LibreTexts. 2020-01-22. Archived from the original on 2021-09-19. Retrieved 2021-09-19.

"Zimmermann Telegram: The Original Draft" Archived 2021-04-27 at the Wayback Machine, 2007, Joachim von zur Gathen, "Cryptologia", Volume 31, Issue 1

A History of U.S. Communications Security; the David G. Boak Lectures Archived 2016-09-18 at the Wayback Machine, National Security Agency (NSA), Volumes I, 1973, Volumes II 1981, partially released 2008, additional portions declassified October 14, 2015
"16.2: Substitution Ciphers". Mathematics LibreTexts. 2020-01-22. Archived from the original on 2021-09-19. Retrieved 2021-09-19.
"Zimmermann Telegram: The Original Draft" Archived 2021-04-27 at the Wayback Machine, 2007, Joachim von zur Gathen, "Cryptologia", Volume 31, Issue 1
Radio Free Europe / Radio Liberty: "Middle East: Islamic Militants Take Jihad To The Internet" By Jeffrey Donovan Archived 2008-01-15 at the Wayback Machine, 16 June 2004.