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NSA
Diana cipher disc · 1987
- this page is a stub
- wanted item
HAL-001, nicknamed Whiz Wheel, was a manual cipher disc,
invented around 1987 by Jeffrey E. Man at the US
National Security Agency (NSA).
It was developed to replace the paper-based mnemonic table
used with the Diana one-time pad cipher system of the
US Special Forces (SF).
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The device consists of two metal discs on a common axle. Each discs has
the 26 letters of the Latin alphabet at its rim – in alphabetical order (A-Z)–
although one of them is reversed.
This effectively makes it a Reversed Caesar Cipher
— a variation on the Vigenère Cipher.
A third – scrambled – alphabet is printed on the outer disc, and is visible
through a window in the inner disc. This is the output letter.
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Device Manual cipher disc Purpose Replacement of one-time pad mnemonic table Principle Modified Vigenère Model HAL-001 Name Whiz wheel Inventor Jeffrey (Jeff) E. Man Manufacturer NSA Country USA Material Aluminium Dimensions ? Weight ? Quantity 15,000 ~ Price USD 10
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- HAL-001
- Diana cipher disc
- Whiz Wheel
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© Crypto Museum. Created: Saturday 02 May 2026. Last changed: Saturday, 02 May 2026 - 07:04 CET.
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