Navy Historic Events

These files relate to the history of cryptology in our nation’s history.

Traffic Analysis from Word War I through Vietnam
 2.25 MB

This brochure — prepared by the National Security Agency, Center for Cryptologic History — defines and explains traffic analysis when used in this context, as part of the broader discipline of signals intelligence. It describes the elements of traffic analysis and explains how traffic analysis has been used to produce intelligence information, to aid cryptanalysis, and to support the collection of additional data. It presents examples of intelligence contributions made by traffic analysis during World War I, World War II, and the Cold War through the Vietnam War.

Station CAST - Tip of the Lance
 374.09 KB

This article, authored by Timothy J. Mucklow and published online by the Society for History in the Federal Government, describes the politics and engineering behind the establishment of Station CAST on Corregidor Island — a project that began in 1934 with a proposal by then-LT Joseph Wenger and ended in 1940 when U.S. Navy cryptologic personnel began operations in the Navy Tunnel at Monkey Point.

Silent Warriors - The U.S. Naval Security Group Reserve, 1945 - 2005
 418.47 KB

This booklet, produced by the Center for Cryptologic History at the National Security Agency, describes the establishment and history of the U.S. Naval Reserve Security Group (U.S. Navy Security Group Reserve) from 1945 through 2005.

The Neglected Giant
 1.49 MB

Johnson, Kevin Wade. “The Neglected Giant: Agnes Meyer Driscoll”, National Security Agency, Center for Cryptologic History, 2015.

Madame X
 326.3 KB

Hanyok, Robert J. "Madame X: Agnes Meyer Driscoll and U.S. Naval Cryptology, 1919 – 1940", National Security Agency, Center for Cryptologic History, Cryptologic Almanac 50th Anniversary Series, 28 February 2003.

A Dangerous Business
 1.96 MB

The U.S. Navy and National Reconnaissance in the Cold War—Commemorating Silent Sacrifices

Mr. John R. Schindler compiled and the Center for Cryptologic History (NSA) published this history of risks encountered by U.S. Navy aircrew and the losses we suffered from Special Electronic Search Projects during the Cold War through the Gulf Wars, beginning with the Soviet shoot-down and loss of the 10-man crew of a U.S. Navy PB4Y2 "Privateer" on 8 April 1950 over the Baltic Ocean southeast of  Liepaja, Latvia.

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