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Privacy enhancement for Internet electronic mail: Part I - message encipherment and authentication procedures (RFC1113) Disclosure Number: IPCOM000001923D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 28 page(s) / 82K

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Internet Society Requests For Comment (RFCs)

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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


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.


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 Step 1: Local Form 12 Step 2: Canonical Form 12 Step 3: Authentication and Encipherment 12 Step 4: Printable Encoding 13 Summary of Transformations 15

4.4 Encapsulation Mechanism 15

4.5 Mail for Mailing Lists 17

4.6 Summary of Encapsulated Header Fields 18

4.6.1 Per-Message Encapsulated Header Fields 20