An official website of the United States government

Here's how you know

Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Current Exhibits

For more information on the exhibits pictured below, please visit our National Cryptologic Museum Exhibit Information page.

American Civil War: Union Code Book

Download Image: Full Size (2.55 MB)

Tags: current-exhibits

Photo by: NSA | VIRIN: 190530-D-IM742-4004.JPG

Photo Gallery