Certificate Transparency Version 2.0
draft-ietf-trans-rfc6962-bis-24

Document Type Active Internet-Draft (trans WG)
Last updated 2016-12-29
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TRANS (Public Notary Transparency)                             B. Laurie
Internet-Draft                                                A. Langley
Obsoletes: 6962 (if approved)                                  E. Kasper
Intended status: Standards Track                              E. Messeri
Expires: July 2, 2017                                             Google
                                                            R. Stradling
                                                                  Comodo
                                                       December 29, 2016

                  Certificate Transparency Version 2.0
                    draft-ietf-trans-rfc6962-bis-24

Abstract

   This document describes version 2.0 of the Certificate Transparency
   (CT) protocol for publicly logging the existence of Transport Layer
   Security (TLS) server certificates as they are issued or observed, in
   a manner that allows anyone to audit certification authority (CA)
   activity and notice the issuance of suspect certificates as well as
   to audit the certificate logs themselves.  The intent is that
   eventually clients would refuse to honor certificates that do not
   appear in a log, effectively forcing CAs to add all issued
   certificates to the logs.

   Logs are network services that implement the protocol operations for
   submissions and queries that are defined in this document.

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
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   This Internet-Draft will expire on July 2, 2017.

Laurie, et al.            Expires July 2, 2017                  [Page 1]
Internet-Draft    Certificate Transparency Version 2.0     December 2016

Copyright Notice

   Copyright (c) 2016 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
   (http://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 and restrictions with respect
   to this document.  Code Components 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
     1.2.  Data Structures . . . . . . . . . . . . . . . . . . . . .   5
     1.3.  Major Differences from CT 1.0 . . . . . . . . . . . . . .   5
   2.  Cryptographic Components  . . . . . . . . . . . . . . . . . .   7
     2.1.  Merkle Hash Trees . . . . . . . . . . . . . . . . . . . .   7
       2.1.1.  Merkle Inclusion Proofs . . . . . . . . . . . . . . .   8
       2.1.2.  Merkle Consistency Proofs . . . . . . . . . . . . . .   9
       2.1.3.  Example . . . . . . . . . . . . . . . . . . . . . . .  10
       2.1.4.  Signatures  . . . . . . . . . . . . . . . . . . . . .  11
   3.  Submitters  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  Certificates  . . . . . . . . . . . . . . . . . . . . . .  12
     3.2.  Precertificates . . . . . . . . . . . . . . . . . . . . .  12
   4.  Log Format and Operation  . . . . . . . . . . . . . . . . . .  13
     4.1.  Accepting Submissions . . . . . . . . . . . . . . . . . .  13
     4.2.  Log Entries . . . . . . . . . . . . . . . . . . . . . . .  14
     4.3.  Log ID  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     4.4.  TransItem Structure . . . . . . . . . . . . . . . . . . .  15
     4.5.  Merkle Tree Leaves  . . . . . . . . . . . . . . . . . . .  17
     4.6.  Signed Certificate Timestamp (SCT)  . . . . . . . . . . .  17
     4.7.  Merkle Tree Head  . . . . . . . . . . . . . . . . . . . .  19
     4.8.  Signed Tree Head (STH)  . . . . . . . . . . . . . . . . .  20
     4.9.  Merkle Consistency Proofs . . . . . . . . . . . . . . . .  20
     4.10. Merkle Inclusion Proofs . . . . . . . . . . . . . . . . .  21
     4.11. Shutting down a log . . . . . . . . . . . . . . . . . . .  21
   5.  Log Client Messages . . . . . . . . . . . . . . . . . . . . .  22
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