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Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication Procedures (RFC1421) Disclosure Number: IPCOM000002248D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 34 page(s) / 97K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People



Status of this Memo

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 3% of the total text.

Network Working Group J. Linn

Request for Comments: 1421 IAB IRTF PSRG, IETF PEM WG

Obsoletes: 1113 February 1993

Privacy Enhancement for Internet Electronic Mail:

Part I: Message Encryption and Authentication Procedures

Status of this Memo

This RFC specifies an IAB standards track protocol for the Internet

community, and requests discussion and suggestions for improvements.

Please refer to the current edition of the "IAB Official Protocol

Standards" for the standardization state and status of this protocol.

Distribution of this memo is unlimited.


This document is the outgrowth of a series of meetings of the Privacy

and Security Research Group (PSRG) of the IRTF and the PEM Working

Group of the IETF. I would like to thank the members of the PSRG and

the IETF PEM WG, as well as all participants in discussions on the

"" mailing list, for their contributions to this


1. Executive Summary

This document defines message encryption and authentication

procedures, in order to provide privacy-enhanced mail (PEM) services

for electronic mail transfer in the Internet. It is intended to

become one member of a related set of four RFCs. The procedures

defined in the current document are intended to be compatible with a

wide range of key management approaches, including both symmetric

(secret-key) and asymmetric (public-key) approaches for encryption of

data encrypting keys. Use of symmetric cryptography for message text

encryption and/or integrity check computation is anticipated. RFC

1422 specifies supporting key management mechanisms based on the use

of public-key certificates. RFC 1423 specifies algorithms, modes,

and associated identifiers relevant to the current RFC and to RFC

1422. RFC 1424 provides details of paper and electronic formats and

procedures for the key management infrastructure being established in

support of these services.

Privacy enhancement services (confidentiality, authentication,

message integrity assurance, and non-repudiation of origin) are

offered through the use of end-to-end cryptography between originator

and recipient processes at or above the User Agent level. No special

processing requirements are imposed on the Message Transfer System at

endpoints or at intermediate relay sites. This approach allows

privacy enhancement facilities to be incorporated selectively on a

site-by-site or user-by-user basis without impact on other Internet

entities. Interoperability among ...