Deriving MPPE Keys From MS-CHAP V1 Credentials
draft-ietf-pppext-mschapv1-keys-00
| Document | Type |
Expired Internet-Draft
(pppext WG)
Expired & archived
|
|
|---|---|---|---|
| Author | Glen Zorn | ||
| Last updated | 1998-09-22 | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
| Intended RFC status | (None) | ||
| Formats | |||
| Additional resources | Mailing list discussion | ||
| Stream | WG state | WG Document | |
| Document shepherd | (None) | ||
| IESG | IESG state | Expired | |
| Consensus boilerplate | Unknown | ||
| Telechat date | (None) | ||
| Responsible AD | (None) | ||
| Send notices to | (None) |
This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:
Abstract
The Point-to-Point Protocol (PPP) [1] provides a standard method for transporting multi-protocol datagrams over point-to-point links. The PPP Compression Control Protocol [2] provides a method to negotiate and utilize compression protocols over PPP encapsulated links. The Microsoft Challenge-Handshake Authentication Protocol (MS-CHAP) [3] is a Microsoft-proprietary PPP authentication protocol, providing the functionality to which LAN-based users are accustomed while integrating the encryption and hashing algorithms used on Windows networks. Microsoft Point to Point Encryption (MPPE) [4] is a means of represent- ing PPP packets in an encrypted form. MPPE uses the RSA RC4 [5] algorithm to provide data confidentiality. The length of the session key to be used for initializing encryption tables can be negotiated. MPPE currently supports 40-bit and 128-bit session keys. MPPE session keys are changed frequently; the exact frequency depends upon the options negotiated, but may be every packet. MPPE is negotiated within option 18 [6] in the Compression Control Protocol. This document describes the method used to derive the initial MPPE ses- sion keys from MS-CHAP credentials. The algorithm used to change ses- sion keys during a session is described in [4].
Authors
(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)