RFC 1969 (rfc1969) - Page 1 of 10
The PPP DES Encryption Protocol (DESE)
Alternative Format: Original Text Document
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
