A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Public-Key Infrastructure (X.509) Working Group of
the IETF.
Title : Internet X.509 Public Key Infrastructure
Time Stamp Protocols (TSP)
Author(s) : C. Adams, P. Cain, D. Pinkas, R. Zuccherato
Filename : draft-ietf-pkix-time-stamp-10.txt
Pages : 24
Date : 12-Oct-00
A time stamping service allows to prove that a datum existed before
a particular time. This document describes the format of a request
sent to a Time Stamping Authority (TSA) and of the response that is
returned. It also establishes several security-relevant requirements
for TSA operation, with regards to processing requests to generate
responses. A TSA may be operated as a Trusted Third Party (TTP)
service, though other operational models may be appropriate, e.g. an
organization might require a TSA for internal time stamping purposes.
Non-repudiation services [ISONR] require the ability to establish the
existence of data before specified times. This protocol may be used as
a building block to support such services. An example of how to prove
that a digital signature was generated during the validity period of
a public key certificate is given in an annex.
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