I-D ACTION:draft-ietf-pkix-time-stamp-15.txt

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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-15.txt
	Pages		: 26
	Date		: 25-May-01
	
A time stamping service supports assertions of proof 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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