TextTell - 1983 - Encrypted Text Transmission

Nap van Zuuren nap.van.zuuren at pandora.be
Sun Apr 20 09:40:03 EDT 2008

In my collection I have : 
TextTell - 1983 - Encrypted Text Transmission via Acoustic Coupler to 
Telephone mouthpiece (  for Transmission ) and Telephone receiver ( for
Reception ) 
Forbidden by the (then West) German BKA for showing at CeBIT 1983 fair 
at Hannover 
Photos on http://picasaweb.google.nl/nap210534/TextTell 
Hope that someone can inform me on which algorithm and which keylenght 
was used on these units. 
Nap van Zuuren - Gent - Belgium 
nap.van.zuuren at pandora.be 

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