Internet-Draft draft-ietf-cose-cbor-encoded-cert-19.txt is now available. It
is a work item of the CBOR Object Signing and Encryption (COSE) WG of the
IETF.
Title: CBOR Encoded X.509 Certificates (C509 Certificates)
Authors: John Preuß Mattsson
Göran Selander
Shahid Raza
Joel Höglund
Martin Furuhed
Lijun Liao
Name: draft-ietf-cose-cbor-encoded-cert-19.txt
Pages: 97
Dates: 2026-05-11
Abstract:
This document specifies a CBOR encoding of X.509 certificates. The
resulting certificates are called C509 certificates. The CBOR
encoding supports a large subset of RFC 5280 and common certificate
profiles, and it is extensible.
Two types of C509 certificates are defined. One type is an
invertible CBOR re-encoding of DER-encoded X.509 certificates with
the signature field copied from the DER encoding. The other type is
identical except that the signature is computed over the CBOR
encoding instead of the DER encoding, thereby avoiding the use of
ASN.1. Both types of certificates have the same semantics as X.509
while providing comparable size reduction.
This document also specifies CBOR-encoded data structures for
certification requests and certification request templates, new COSE
headers, as well as a TLS certificate type and a file format for
C509. This document updates RFC 6698 by extending the TLSA selectors
registry to include C509 certificates.
The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-cose-cbor-encoded-cert/
There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-ietf-cose-cbor-encoded-cert-19.html
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-cose-cbor-encoded-cert-19
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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