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12 September 2012

Certificate Transparency IETF Working Group 2


Topic discussion:

Network Working Group B. Laurie Internet-Draft A. Langley Expires: March 16, 2013 E. Kasper September 12, 2012 Certificate Transparency draft-laurie-pki-sunlight-00 Abstract The aim of Certificate Transparency is to have every public end- entity TLS certificate issued by a known Certificate Authority recorded in one or more certificate logs. In order to detect mis- issuance of certificates, all logs are publicly auditable. In particular, domain owners will be able to monitor logs for certificates issued on their own domain. In order to protect clients from unlogged mis-issued certificates, logs sign all recorded certificates, and clients can choose not to trust certificates that are not accompanied by an appropriate log signature. For privacy and performance reasons log signatures are embedded in the TLS handshake via the TLS authorization extension [RFC5878], or in the certificate itself via an X.509v3 certificate extension [RFC5280]. In order to ensure a globally consistent view of the log, logs also provide a global signature over the entire log. Any inconsistency of logs can be detected through cross-checks on the global signature. Logs are only expected to certify that they have seen a certificate and thus, we do not specify any revocation mechanism for log signatures in this document. Logs will be append-only, and log signatures will be valid indefinitely. 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 Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference Laurie, et al. Expires March 16, 2013 [Page 1] Internet-Draft Certificate Transparency September 2012 material or to cite them other than as "work in progress." This Internet-Draft will expire on March 16, 2013. Copyright Notice Copyright (c) 2012 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 ( 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.