Deriving MPPE Keys From MS-CHAP V1 Credentials
draft-ietf-pppext-mschapv1-keys-00
Document | Type | Expired Internet-Draft (pppext WG) | |
---|---|---|---|
Author | Glen Zorn | ||
Last updated | 1998-09-22 | ||
Stream | IETF | ||
Intended RFC status | (None) | ||
Formats |
Expired & archived
pdf
htmlized (tools)
htmlized
bibtex
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Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | Expired | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
https://www.ietf.org/archive/id/draft-ietf-pppext-mschapv1-keys-00.txt
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
Glen Zorn (glenzorn@hotmail.com)
(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)