Time-Stamping is a cryptographic technique which allows us to prove that an electronic document existed at a certain point in time and that it has not been modified since then. Different time-stamping schemes have already been proposed. Most of them use the concept of trusted Time-Stamping Authority (TSA). A TSA is in charge of time-stamping documents and delivering a time-stamping certificate for each time-stamped document. The purpose of this paper is to propose a new time-stamping scheme using a Local Time-stamping System (LTS). The main idea can be summarised as follows: digests of the documents to be time-stamped are sent to a Local Time-stamping System (LTS). The LTS accumulates the digests into a round value using a round-based protocol. The round value is then time-stamped by a trusted and official TSA. We show how this time-stamping scheme could be useful for an organisation such as a digital library or a company. © 2002 Kluwer Academic / Plenum Publishers, New York.
CITATION STYLE
Gabillon, A., & Byun, J. (2002). A two-level time-stamping system. In IFIP Advances in Information and Communication Technology (Vol. 65, pp. 139–149). Springer New York LLC. https://doi.org/10.1007/0-306-46998-7_10
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