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Telex encryptor - this page is a stub

GC-521, or Gretacoder 521, was a custom-made encryption/decryption device for teleprinter signals (telex), developed around 1980 by Gretag in Regensdorf (Switzerland) as an add-on for the Hasler SP-300 teleprinter. The complete teleprinter with crypto was known as SP-300 GCA.

  1. SP-300-GCA, Chiffrier-Fernschreiber, datasheet
    Hasler AG, Bern. Date unknown (German/French).

  2. SP 300 GCA, Cipher Teleprinter, full-colour brochure
    Gretag Limited, 1980 (English).
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Crypto Museum. Created: Tuesday 18 June 2019. Last changed: Tuesday, 18 June 2019 - 16:58 CET.
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