CMS%20Advanced%20Electronic%20Signatures%20(CAdES)

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CMS Advanced Electronic Signatures (CAdES)

• Target Category Informational
• Intended to update and replace RFC 3126
• IETF Meeting Paris - August 2005
• Denis Pinkas (Denis.Pinkas_at_bull.net)

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Historic

• RFC 3126, issued in September 2001, as an S-MIME
  WG document, is a transposition of ETSI TS 101
  733 v.1.2.2., called  Electronic Signature
  Formats for long term electronic signatures It
  describes electronic signature formats using CMS
  (Cryptographic Message Syntax).
• ETSI has issued a companion document describing
  electronic signature formats using XML
  (Extensible Markup Language), ETSI TS 101 903,
  called  XML Advanced Electronic Signatures
  (XAdES)  

ETSI European Telecommunications Standards
Institute.
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CAdES and XAdES

• In order to easily make the difference between
  the two electronic signature formats, ETSI TC ESI
  has decided to use two acronyms
•  CAdES  for CMS Advanced Electronic Signatures,
  and
•  XAdES  for XML Advanced Electronic
  Signatures.
• .. and hence to change the title of the
  Technical Standard.
• ETSI is in the process of issuing TS 101 733
  v.1.6.3. In order to promote the knowledge of
  the document, ETSI is proposing to update and
  replace RFC 3126.

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Major changes (see annex J)

• The non-mandatory to support formats have been
  placed in informative annexes they allow for
  very long term conservation.
• The title and the vocabulary have been aligned
  with XAdES.
• In the previous ETSI version of TS 101 733 (i.e.
  v1.5.1) sigPolicyHash was mandatory.
  Implementations requiring to be backward
  compatible with version 1.5.1 and previous
  versions of the current document MUST include
  SigPolicyHash.
• The OIDs from the ASN.1 modules have been
  updated.
• The new ASN.1 modules have been fully checked,
  ... since the publication of the I-D, and the
  I-D will need to be updated to correct a few
  typos.

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The document is available at

• http//www.ietf.org/internet-drafts/draft-pinkas-
  smime-cades-00.txt
• For more information, contact one of the
  co-editors.