Signature Validation Token
draft-santesson-svt-pdf-00

Document Type Active Internet-Draft (individual)
Authors Stefan Santesson  , Russ Housley 
Last updated 2020-10-23
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Network Working Group                                       S. Santesson
Internet-Draft                                           IDsec Solutions
Intended status: Standards Track                              R. Housley
Expires: 24 April 2021                                    Vigil Security
                                                         21 October 2020

                       Signature Validation Token
                       draft-santesson-svt-pdf-00

Abstract

   This document defines a PDF profile for the Signature Validation
   Token defined in [SVT].

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 24 April 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
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
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   extracted from this document must 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.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  SVT in PDF Documents  . . . . . . . . . . . . . . . . . . . .   3
     3.1.  SVT Extension to Timestamp Tokens . . . . . . . . . . . .   3
   4.  SVT Claims  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Signature Reference Data  . . . . . . . . . . . . . . . .   3
     4.2.  Signed Data Reference Data  . . . . . . . . . . . . . . .   4
     4.3.  Signer Certificate References . . . . . . . . . . . . . .   4
   5.  JOSE Header . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  SVT Signing Key Reference . . . . . . . . . . . . . . . .   4
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The "Signature Validation Token" specification [SVT] defines a basic
   token to support signature validation in a way that can significantly
   extend the lifetime of a signature.

   This specification defines a profile for implementing SVT with a
   signed PDF document, and defines the following aspects of SVT usage:

   *  How to include reference data related to PDF signatures and PDF
      documents in an SVT.

   *  How to add an SVT token to a PDF document.

   PDF document signatures are added as incremental updates to the
   signed PDF document and signs all data of the PDF document up until
   the current signature.  When more than one signature is added to a
   PDF document the previous signature is signed by the next signature
   and can not be updated with additional data after this event.

   To minimize the impact on PDF documents with multiple signatures and
   to stay backwards compatible with PDF software that do not understand
   SVT, PDF documents add one SVT token for all signatures of the PDF as
   an extension to a document timestamp added to the signed PDF as an
   incremental update.  This SVT covers all signatures of the signed
   SVT.

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2.  Definitions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   The definitions in [SVT] apply also to this document.

3.  SVT in PDF Documents

   An SVT added to a signed PDF document SHALL be added to a document
   timestamp accordance with ISO 32000-2:2017 [ISOPDF2].

   The document timestamp contains an [RFC3161] timestamp token
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