Crypto Questions

[Ian BROWN]

Peter Fairbrother <peter.fairbrother@ntlworld.com> asked:
>1) Is there a way to have reliable authentication that is repudiable? I
>think the concepts are too similar, but it would be useful.

Adam Back and my thoughts on the subject for PGP:

Ian Brown and Adam Back. Non-transferable signatures using PGP.
Work-in-progress, Usenix Annual Technical Conference, New Orleans,
June 1998. 

http://www.cs.ucl.ac.uk/staff/I.Brown/nts.htm