Slidex

Slidex was a hand-held, paper-based encryption system used at a low, front line (platoon, troop and section) level in the British Army during the Cold War period. It was replaced by the BATCO tactical code, which, in turn has been largely made obsolete by the Bowman secure voice radios.

Design
A Slidex, bearing a date 12/43, with one vocabulary card and code strips in place, and two more different cards..

Slidex used a series of vocabulary cards arranged in a grid of 12 rows and 17 columns. Each of the 204 resulting cells has a word or phrase, as well as a letter or number. The latter allowed the system to spell out words and transmit numbers.

The cards were stored in a folding case that had a pair of cursors to facilitate locating cells. Messages were encrypted and decrypted using code strips that could be placed in holder along the top and left side of the vocabulary card. Blank vocabulary cards were provided to allow units to create a word set for a specific mission.

gollark: The #esolang-showcase incident.
gollark: Well, there's the random muting/punishment of people for tiny things or literally nothing.
gollark: What if lyricly develops multiple personalities?
gollark: No, it would just be bad.
gollark: Since sinth foolishly thinks communism good, and I correctly think communism very bad, if rule 11 was implemented no communism opinions would be possible.

See also

Further reading
  • "The Slidex RT Code", Cryptologia 8(2), April 1984

References
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