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Hans Bühler
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Hans Bühler was a sales representative of Crypto AG (Hagelin) in Zug (Switzerland). As such, he frequently travelled the Middle East, selling cipher machines to countries like Saudi Arabia and Iran. In 1992, The Iranians suspected the Hagelin equipment to have a backdoor that gave the Americans access to their traffic. Bühler was arrested and spent the next nine months in prison.
 
...   
Cover of the book 'Verschlüsselt, Der Fall Hans Bühler'

 
References
  1. Verschlüsselt, Der Fall Hans Bühler
    ISBN 3-85932-141-2. 1994.

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