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Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Certificate Handling
RFC 8550

Approval announcement
Draft of message to be sent after approval:


From: The IESG <>
To: IETF-Announce <>
Cc:,, Russ Housley <>,,,, The IESG <>,
Subject: Protocol Action: 'Secure/Multipurpose Internet Mail Extensions (S/ MIME) Version 4.0 Certificate Handling' to Proposed Standard (draft-ietf-lamps-rfc5750-bis-08.txt)

The IESG has approved the following document:
- 'Secure/Multipurpose Internet Mail Extensions (S/ MIME) Version 4.0
   Certificate Handling'
  (draft-ietf-lamps-rfc5750-bis-08.txt) as Proposed Standard

This document is the product of the Limited Additional Mechanisms for PKIX
and SMIME Working Group.

The IESG contact persons are Benjamin Kaduk and Eric Rescorla.

A URL of this Internet Draft is:

Ballot Text

  Technical Summary:

    This document specifies the certificate handling for S/MIME 4.0.
    The changes since S/MIME 3.2 include required support for EAI
    (internationalized email addresses), increased RSA key sizes,
    moving old one-way hash functions to historic status, and
    requiring support for ECDSA with P-256 and Ed25519.

  Working Group Summary:

    There is strong consensus for this document in the LAMPS WG.

  Document Quality:

    S/MIME has wide support, and several implementers have said that
    they will implement the new features in this document.


    Russ Housley is the document shepherd.
    Eric Rescorla is the responsible area director.

RFC Editor Note