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How to time-stamp a digital document. (English) Zbl 0800.68408

Menezes, Alfred J. (ed.) et al., Advances in cryptology - CRYPTO ’90. A conference on the theory and application of cryptography, Univ. of California, Santa Barbara, USA, August 11-15, 1990. Proceedings. Berlin etc.: Springer-Verlag. Lect. Notes Comput. Sci. 537, 437-455 (1991).
Summary: The prospect of a world in which all text, audio, picture, and video documents are in digital form on easily modifiable media raises the issue of how to certify when a document was created or last changed. The problem is to time-stamp the data, not the medium. We propose computationally practical procedures for digital time-stamping of such documents so that it is infeasible for a user either to back-date or to forward-date his document, even with the collusion of a time-stamping service. Our procedures maintain complete privacy of the documents themselves, and require no record-keeping by the time-stamping service.
For the entire collection see [Zbl 0782.00081].

MSC:

68P25 Data encryption (aspects in computer science)
94A60 Cryptography
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