How to Time-Stamp a Digital Document

  • Stuart Haber
  • W. Scott Stornetta
Conference paper

DOI: 10.1007/3-540-38424-3_32

Part of the Lecture Notes in Computer Science book series (LNCS, volume 537)
Cite this paper as:
Haber S., Stornetta W.S. (1991) How to Time-Stamp a Digital Document. In: Menezes A.J., Vanstone S.A. (eds) Advances in Cryptology-CRYPT0’ 90. CRYPTO 1990. Lecture Notes in Computer Science, vol 537. Springer, Berlin, Heidelberg


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.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • Stuart Haber
    • 1
  • W. Scott Stornetta
    • 1
  1. 1.BellcoreMorristown

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