Distributed Ledger Time-Stamp
draft-intesigroup-dlts-01
Network Working Group E. Cisbani
Internet-Draft D. Ribaudo
Intended status: Standards Track G. Damiano
Expires: July 11, 2021 Intesi Group
January 7, 2021
Distributed Ledger Time-Stamp
draft-intesigroup-dlts-01
Abstract
This document defines a standard to extend Time Stamp Tokens with
Time Attestations recorded on Distributed Ledgers.
The aim is to provide long-term validity to Time Stamp Tokens,
backward compatible with currently available software.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terms and Definitions . . . . . . . . . . . . . . . . . . . . 3
3. Symbols And Abbreviations . . . . . . . . . . . . . . . . . . 5
4. DL Attestation . . . . . . . . . . . . . . . . . . . . . . . 5
5. DL Time-Stamp Objects . . . . . . . . . . . . . . . . . . . . 6
5.1. DL Time-Stamp Attributes . . . . . . . . . . . . . . . . 7
5.1.1. Response Status . . . . . . . . . . . . . . . . . . . 8
5.2. DL Time-Stamp Extensions . . . . . . . . . . . . . . . . 8
5.2.1. Response Status . . . . . . . . . . . . . . . . . . . 9
6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.1. Normative References . . . . . . . . . . . . . . . . . . 10
8.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
Attesting that a file existed prior to a specific point in time can
be useful - for example - to:
o prove when an agreement was signed, if it is disputed
o validate a signature after a revocation occurred
o prove the ownership for copyright
o grant record integrity
A Time-Stamp Token (TST) provided by a Time-Stamp Authority (TSA)
compliant with RFC 3161 [RFC3161] can be based on an accurate time
source linked to Coordinated Universal Time, and can be very precise
- it can prove the existence also at the second or less. It is such
a consolidated standard that - for example - the European Union
legally enforced its usage by eIDAS Regulation [eIDAS], European
Standards and Technical Specifications [ETSI.EN.319.422]
[ETSI.TS.101.861].
In an in-deep appraisal of Time Stamping Schemes conducted in 2001 by
Masashi Une [IMES], PKI TSA was evaluated as one of the most
desirables in term of security against alteration of a time stamp.
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The integrity of the timestamping process that is inevitably bound to
the integrity of the TSA gave rise to other proposals like ANSI X9.95
[ANSI.X9.95] and ISO/IEC 18014-4 [ISO.IEC.18014-4].
Furthermore a TSA TST can be validated for a limited time - usually
no longer than 20 years for technical reasons such as the TSA
certificates expiration, or for economic reasons such as the cost of
providing the validation service by TSA.
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