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Cipher procedure

Cipher procedure 50010 (German: Chiffrierverfahren 50010) was a manual cipher system that consisted of a code book and subsitution table 535 (German: Susbstitutionstafel 535). It was introduced in the DDR (East-Germany) in 1980 and was used by East German border patrol [1].

The plaintext was converted into numbers first, by means of a codebook. Any words or common expressions that were not covered by the codebook, were converted into numbers by means of substitution table 535 above. The result was then encrypted with cipher procedure 001 [1]. Once the message was encrypted, it was usually send via radio by means of morse code telegraphy.

  1. Jörg Drobick, Substitutionstabelle 535 und manuelles Chiffrierverfahren '50010'...
    Website Der SAS- und Chiffrierdienst (SCD). Retrieved May 2016.

  2. Substitutionstafel 535/30003
    Date unknown. Retrieved June 2008.
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Crypto Museum. Created: Sunday 29 May 2016. Last changed: Friday, 23 February 2018 - 22:17 CET.
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