An Evaluation Method of Time Stamping Schemes from Viewpoints of Integrity, Cost and Availability

Masashi UNE  Tsutomu MATSUMOTO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E86-A   No.1   pp.151-164
Publication Date: 2003/01/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Protocols etc.
availability,  cost,  evaluation method,  integrity,  time stamp,  

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This paper presents a new method to evaluate time stamping schemes from three viewpoints: integrity of a time stamp, cost of issuing and verifying a time stamp and availability of the schemes. The main advantage of the proposed evaluation method is to clarify whether or not a certain scheme is optimal under certain prioritized requirements. Therefore, the proposed method can help potential users of time stamping services select an appropriate one which meets their prioritized requirements. In this paper, we explain the basic idea of the evaluation method and show how to use it by applying it to seven existing schemes.