Compiled by Tina Bird, Moderator,
VPN Mailing List
Last modified: 06 August 1999
Microsoft's overview of PPTP functionality.
Windows Remote Access Security describes the security
features of PPTP and provides information on planning your deployment.
Understanding Point-to-Point Tunneling Protocol
Using Point-to-Point Tunneling Protocol
FAQ about Microsoft VPN Security
Cooper's original summary of PPTP, addressed to the Firewalls@Greatcircle.com
mailing list in November 1997. Mostly addresses problems with session
key generation and weak authentication mechanisms.
to Firewall-Wizards about crypto vulnerabilities in PPTP. Not quite
so polished as the Counterpane documentation, but valuable.
In Defense of
PPTP, a response to criticisms of Microsoft's PPTP implementation
(and how the NTS implementation avoids those problems).
from the VPN FAQ.
The Counterpane PPTP Analysis
Bruce Schneier and Mudge identify several major flaws in the Microsoft
implementation of PPTP, June 1998.
Microsoft;s PPTP Authentication Extensions (MS-CHAPv2)