RFC 1113 (rfc1113) - Page 1 of 34
Privacy enhancement for Internet electronic mail: Part I - message encipherment and authentication procedures
Alternative Format: Original Text Document
Network Working Group J. Linn
Request for Comments: 1113 DEC
Obsoletes RFCs: 989, 1040 IAB Privacy Task Force
August 1989
Privacy Enhancement for Internet Electronic Mail:
Part I -- Message Encipherment and Authentication Procedures
STATUS OF THIS MEMO
This RFC suggests a draft standard elective protocol for the Internet
community, and requests discussion and suggestions for improvements.
Distribution of this memo is unlimited.
ACKNOWLEDGMENT
This RFC is the outgrowth of a series of IAB Privacy Task Force
meetings and of internal working papers distributed for those
meetings. I would like to thank the following Privacy Task Force
members and meeting guests for their comments and contributions at
the meetings which led to the preparation of this RFC: David
Balenson, Curt Barker, Jim Bidzos, Matt Bishop, Danny Cohen, Tom
Daniel, Charles Fox, Morrie Gasser, Russ Housley, Steve Kent
(chairman), John Laws, Steve Lipner, Dan Nessett, Mike Padlipsky, Rob
Shirey, Miles Smid, Steve Walker, and Steve Wilbur.
Table of Contents
1. Executive Summary 2
2. Terminology 3
3. Services, Constraints, and Implications 3
4. Processing of Messages 7
4.1 Message Processing Overview 7
4.1.1 Types of Keys 7
4.1.2 Processing Procedures 8
4.2 Encryption Algorithms and Modes 9
4.3 Privacy Enhancement Message Transformations 10
4.3.1 Constraints 10
4.3.2 Approach 11
4.3.2.1 Step 1: Local Form 12
4.3.2.2 Step 2: Canonical Form 12
4.3.2.3 Step 3: Authentication and Encipherment 12
4.3.2.4 Step 4: Printable Encoding 13
4.3.2.5 Summary of Transformations 15
4.4 Encapsulation Mechanism 15
4.5 Mail for Mailing Lists 17
4.6 Summary of Encapsulated Header Fields 18
Linn