Security & Hacking: "Stop using PPTP and switch to other technologies like IPsec or OpenVPN"

Article on Computerworld, about tools released at "Defcon security conference that can be used to crack the encryption of any PPTP (Point-to-Point Tunneling Protocol) and WPA2-Enterprise (Wireless Protected Access) sessions that use MS-CHAPv2 for authentication."

Bruce Schneir has written about problems with MS_CHAPv2 see http://www.schneier.com/pptp.html or full paper at http://www.schneier.com/paper-pptpv2.html