- K. Matsuura and H. Imai. ``Digital Timestamps for Dispute Settlement in Electronic Commerce: Generation, Verification, and Renewal'', Proceedings of 4th International Conference on Enterprise Information Systems (ICEIS 2002), Volume 2, ICEIS Press, pp.962-967, April, 2002. (Full text (PDF))
- (Abstract) Digital notary is receiving more and more attention as a social infrastructure in the network society. Digital time-stamping is a simple but very important form of the notary, and can be used to provide long-term authenticity. Its function is essential for dispute settlement in electronic commerce. This importance motivated us to have a clear survey on how to generate/verify digital time-stamps.
- In order to make longer use of digital time-stamping functions, we may have to update or renew our time-stamps. The renewal must be completed before the expiry of the current time-stamp. However, the congestion problem of the renewal request has not yet been studied well. So the survey is followed by an investigation of renewal feasibility. The investigation uses a simple model in which the service provider's mind and the users' mind are independently represented by two different parameters. The condition for accepting renewal requests without queueing is discussed by using the two parameters.
- Another issue will occur when we submit high-dimensional contents to be time-stamped and the components of the contents are updated independently in later time; memory requirement on the client depends on the submission strategy. A discussion on different strategies is given as well.
- (Keywords) Digital notary, time-stamp, dispute settlement, long-lived authenticity.
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