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Privacy enhancement for Internet electronic mail: Part I - message encipherment and authentication procedures (RFC1113)

IP.com Disclosure Number: IPCOM000001923D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 28 page(s) / 82K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Linn: AUTHOR

Abstract

STATUS OF THIS MEMO

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 4% of the total text.

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

4.6.1 Per-Message Encapsulated Header Fields 20

4.6.1.1 X-Proc-Type Field 20

4.6.1.2 X-DEK-Info Field 21

4.6.2 Encapsulated Header Fields Normally Per-Message 21

4.6.2.1 X-Sender-ID Field 22

4.6.2.2 X-Certificate Field ...