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Alternative authentication & SPKI

Has any work been done on using SPKI or PolicyMaker
with alternative authentications schemes, such
as ZKIP, designated confirmer signatures, 
undeniable signatures, etc.?   To what
extent to SPKI and PolicyMaker depend on
the features of traditional public key 
signatures -- e.g. nonrepudiation and an unrestricted 
set of verifiers?

Nick Szabo