Network Working Group H. Kummert Request for Comments: 2420 Nentec GmbH Category: Standards Track September 1998 The PPP Triple-DES Encryption Protocol (3DESE) Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (1998). All Rights Reserved. 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 Triple-DES standard (3DES) [6] for encrypting PPP encapsulated packets. Table of Contents 1. Introduction .............................................. 2 1.1 Algorithm ................................................. 2 1.2 Keys ...................................................... 3 2. 3DESE Configuration Option for ECP ........................ 3 3. Packet format for 3DESE ................................... 4 4. Encryption ................................................ 5 4.1 Padding ................................................... 5 4.2 Recovery after packet loss ................................ 6 5. Security Considerations ................................... 6 6. References ................................................ 7 7. Acknowledgements .......................................... 7 8. Author's Address .......................................... 7 9. Full Copyright Statement .................................. 8 Kummert Standards Track