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 [EMAIL PROTECTED]
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