DRYAD
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The DRYAD Numeral Cipher/Authentication System is a simple, paper cryptographic system employed by the U.S. military for authentication and for encryption of short, numerical messages. Each unit with
Holder for coding sheets with slide to facilitate use
M-94 (cipher machine)
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The M-94 was a piece of cryptographic equipment used by the United States Army, consisting of several lettered discs arranged as a cylinder. It was also employed by the US Navy, under the name CSP 488
DRYAD
…BATCO – similar paper based tactical cipher used by the British forces M-94 – tactical cipher used in World War II Dryad – original meaning in mythology…
The M-94 at the National Cryptologic Museum
An M-138-A at the National Cryptologic Museum"