18th century cipher device
It is thought that this device may be the oldest extant "true cipher device" in the world.
Click here to read the related story on the National Cryptologic Museum, and click here to check out the entire Road Trip 2010 package.
August 6, 2010 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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