RFC 1421 · HISTORIC · 1993
SUN · 14 JUN 2026
Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication Procedures
Overview
RFC 1421, “Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication Procedures”, is a Historic document published in February 1993 by J. Linn. It obsoletes RFC 1113. The canonical text is published by the RFC Editor.
Abstract
This document defines message encryption and authentication procedures, in order to provide privacy-enhanced mail (PEM) services for electronic mail transfer in the Internet. [STANDARDS-TRACK]
What “Historic” means
A specification that has been superseded or is otherwise no longer recommended for use.
Read this RFC
The canonical text of RFC 1421 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1993
- RFC 1420 SNMP over IPX
- RFC 1422 Privacy Enhancement for Internet Electronic Mail: Part II: Certificate-Based Key Management
- RFC 1419 SNMP over AppleTalk
- RFC 1423 Privacy Enhancement for Internet Electronic Mail: Part III: Algorithms, Modes, and Identifiers
- RFC 1418 SNMP over OSI
- RFC 1424 Privacy Enhancement for Internet Electronic Mail: Part IV: Key Certification and Related Services
- RFC 1417 NADF Standing Documents: A Brief Overview
- RFC 1425 SMTP Service Extensions