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The PPP DES Encryption Protocol (DESE) (RFC1969)

IP.com Disclosure Number: IPCOM000004256D
Original Publication Date: 1996-Jun-01
Included in the Prior Art Database: 2019-Feb-12
Document File: 10 page(s) / 13K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Sklower: AUTHOR [+1]

Related Documents

10.17487/RFC1969: DOI

Abstract

This document provides specific details for the use of the DES standard [5, 6] for encrypting PPP encapsulated packets. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 17% of the total text.

Network Working Group K. Sklower Request for Comments: 1969 University of California, Berkeley Category: Informational G. Meyer Spider Systems June 1996

The PPP DES Encryption Protocol (DESE)

Status of This Memo

This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

Abstract

The Point-to-Point Protocol (PPP) [1] provides a standard method for transporting multi-protocol datagrams over point-to-point links.

The PPP Encryption Control Protocol (ECP) [2] provides a method to negotiate and utilize encryption protocols over PPP encapsulated links.

This document provides specific details for the use of the DES standard [5, 6] for encrypting PPP encapsulated packets.

Acknowledgements

The authors extend hearty thanks to Fred Baker of Cisco for helpful improvements to the clarity of the document.

Table of Contents

1. Introduction ................................................ 2 1.1. Motivation ................................................ 2 1.2. Conventions ............................................... 2 2. General Overview ............................................ 2 3. Structure of This Specification ............................. 3 4. DESE Configuration Option for ECP ........................... 4 5. Packet Format for DESE ...................................... 5 6. Encryption .................................................. 6 6.1. Padding Considerations .................................... 6 6.2. Generation of the Ciphertext .............................. 7 6.3. Retrieval of the Plaintext ................................ 8 6.4. Recovery after Packet Loss ................................ 8 7. MRU Considerations .......................................... 8 8. Security Considerations ..................................... 9

Sklower & Meyer Informational [Page 1]

RFC 1969 PPP DES Encryption June 1996

9. References .................................................. 9 10. Authors’ Addresses ......................................... 10 11. Expiration Date of this Draft .............................. 10

1. Introduction

1.1. Motivation

The purpose of this memo is two-fold: to show how one specifies the necessary details of a "data" or "bearer" protocol given the context of the generic PPP Encryption Control Protocol, and also to provide at least one commonly-understood means of secure data transmission between PPP implementations.

The DES encryption algorithm is a well studied, understood and widely implemented encryption algorithm. The DES cipher was designed for efficient implementation in hardware, and consequently may be relatively expensive to implement in software. However, its pervasiveness makes it seem like a reasonable choice for a "model" encryption protocol.

Source code implementing DES in the "Electronic Code Book Mode" can be found in [7]. US export laws forbid the inclusion of compilation-ready source code in this document.

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