RFC 3855 · PROPOSED STANDARD · 2004
SUN · 14 JUN 2026
Transporting Secure/Multipurpose Internet Mail Extensions Objects in X.400
Overview
RFC 3855, “Transporting Secure/Multipurpose Internet Mail Extensions Objects in X.400”, is a Proposed Standard document published in July 2004 by P. Hoffman, C. Bonatti. The canonical text is published by the RFC Editor.
Abstract
This document describes protocol options for conveying objects that have been protected using the Cryptographic Message Syntax (CMS) and Secure/Multipurpose Internet Mail Extensions (S/MIME) version 3.1 over an X.400 message transfer system. [STANDARDS-TRACK]
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.
Read this RFC
The canonical text of RFC 3855 is hosted at rfc-editor.org. Available in TXT,HTML.
Other RFCs from 2004
- RFC 3854 Securing X.400 Content with Secure/Multipurpose Internet Mail Extensions
- RFC 3856 A Presence Event Package for the Session Initiation Protocol
- RFC 3853 S/MIME Advanced Encryption Standard Requirement for the Session Initiation Protocol
- RFC 3857 A Watcher Information Event Template-Package for the Session Initiation Protocol
- RFC 3852 Cryptographic Message Syntax
- RFC 3858 An Extensible Markup Language Based Format for Watcher Information
- RFC 3851 Secure/Multipurpose Internet Mail Extensions Version 3.1 Message Specification
- RFC 3859 Common Profile for Presence