Distributed Ledger Time-Stamp
draft-intesigroup-dlts-00

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Network Working Group                                         E. Cisbani
Internet-Draft                                                D. Ribaudo
Updates: 3161 (if approved)                                   G. Damiano
Intended status: Standards Track                            Intesi Group
Expires: January 8, 2021                                    July 7, 2020

                     Distributed Ledger Time-Stamp
                       draft-intesigroup-dlts-00

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.

   This document update RFC 3161 [RFC3161].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 8, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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
     5.3.  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