WWI - Code Disk
 
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With instructions for use on the reverse side. (Photos courtesy E-bay)

This code disk was used in the field by the U.S. Army Signal Corps at the beginning of World War I. The disk enabled messages to be quickly encrypted with a simple substitution cipher by rotating the inner ring.



Contributors and Credits:

1) Encyclopedia Britannica     http://www.britannica.com

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May 23/08