Secure/Multipurpose Internet Mail Extensions Version 4.0 Certificate Handling
RFC 8550, “Secure/Multipurpose Internet Mail Extensions Version 4.0 Certificate Handling”, is a Proposed Standard document published in April 2019 by J. Schaad, B. Ramsdell, S. Turner. It obsoletes RFC 5750. The canonical text is published by the RFC Editor.
Abstract
This document specifies conventions for X.509 certificate usage by Secure/Multipurpose Internet Mail Extensions (S/MIME) v4.0 agents. S/MIME provides a method to send and receive secure MIME messages, and certificates are an integral part of S/MIME agent processing. S/MIME agents validate certificates as described in RFC 5280 ("Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile"). S/MIME agents must meet the certificate-processing requirements in this document as well as those in RFC 5280. This document obsoletes RFC 5750.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 8550 is hosted at rfc-editor.org. Available in TXT,HTML.
- RFC 8549 Export of BGP Community Information in IP Flow Information Export
- RFC 8551 Secure/Multipurpose Internet Mail Extensions Version 4.0 Message Specification
- RFC 8548 Cryptographic Protection of TCP Streams
- RFC 8552 Scoped Interpretation of DNS Resource Records through "Underscored" Naming of Attribute Leaves
- RFC 8547 TCP-ENO: Encryption Negotiation Option
- RFC 8553 DNS Attrleaf Changes: Fixing Specifications That Use Underscored Node Names
- RFC 8546 The Wire Image of a Network Protocol
- RFC 8554 Leighton-Micali Hash-Based Signatures