How Safe is PPTP?

Much discussion is occurring about the security of the tunnel establishedbetween the client and the server. Bruce Schneier, president of thecryptographic consulting firm Counterpane Systems and author of AppliedCryptography (John Wiley & Sons), has raised serious concerns about thesecurity of Microsoft's implementation of the Point-to-Point Tunneling Protocol (PPTP). You can find information about Counterpane Systems' cracking of PPTP at http://www.counterpane.com/pptp.html. You can find Microsoft's response to Counterpane Systems' concerns at http://www.microsoft.com/ntserver/basics/communications/ basics/securevpn/default.asp.