TextTell - 1983 - Encrypted Text Transmission

[Nap van Zuuren]

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. 
T.I.A. 
Nap van Zuuren - Gent - Belgium 
nap.van.zuuren at pandora.be 



---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to majordomo at metzdowd.com