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Subject: RE: [dss] EPM use cases: some questions and one requeriment.
At 01:53 PM 6/25/2003 +0200, Gray Steve wrote: >Dear Colleagues > >I have attached a document where I have collated most of your questions >regarding the EPM use cases and provided answers. > >Please let me know if there are further clarifications required and I can >prepare something for discussion at Monday's telephone conference. Thanks, My questions that remain, which we can discuss in email or at the concall: What is the point of the sender acquiring a "postmark" on his document? To whom is this postmark meaningful, and what does it mean? According to A11, "The main purpose of the EPM is to provide a non-repudiation service that attests Who, What, Why, When a document was signed, plus the archival service". Isn't this provided by a normal, time-stamped digital signature? Why is the archival service necessary? How is it used? A use case that demonstrated the entirety of the legal challenge/dispute resolution process might make things more clear. Otherwise I'm not sure what attacks these measures are meant to defend against, or what requirements they're meant to fulfill. Trevor
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