Information about Signal Intelligence and the Pusan Perimeter.

"A study of how Allied communications intelligence organizations reported intelligence on the Holocaust. Explains how the Western COMINT system operated during WWII; describes how the wartime records of SIS and GC & CS are organized in the U.S. and UK; summarizes what information is available from SIGINT records about the Holocaust"--Resource description page.

"A study of cryptologic documents dealing with the issue of American pre-knowledge of the Pearl Harbor attack"--Resource description page.

This publication joins two cryptologic history monographs that were published separately in 1989. Part I (German clandestine activites), identifies and presents a thorough account of German intelligence organizations engaged in clandestine work in South America as well as a detailed report of the U.S. response to the perceived threat. Part II (The cryptology of the German intelligence services) deals with the cryptographic systems used by the varioius...

The history of various aspects of the development of the U.S. Navy's communications intelligence structure and processes in the years leading up to the attack on Pearl Harbor.

"Cryptology is the art and science of secret communication, and its purpose is to protect precious information and keep people safe. Learn about its building blocks: ciphers, codes, and keys"--

"Read about the historical code makers and breakers who protected their countries by coding and decoding messages for their governments, and the modern cryptologists who keep emails, texts, and online purchases secure"--

"Steganography is the art of concealing messages in plain sight. Read about invisible inks, the Cardano Grille, the use of microdots in WWI, and the butterfly maps of Lord Baden-Powell"--