Our intel shows us that the Zombies use a MS-PPTP like protocol and luckily we could intercept a challenge-response transmission of one of the Zombie outposts. The important thing for Zombies in this war is mass! Not only brain mass but their mass. So they built their PPTP protocol compatible to all older Zombie soldiers. Luckily our science team could extract the algorithm of the challenge-response system out of a captured Zombie brain … I spare you the details, let's just say it was not a pretty sight. And here comes your part soldier: we need the password of this intercepted transmission. With this password we were finally able to turn this war to our favor. So move your ass soldier and good luck!

http://dl.ctftime.org/38/120/pptp.tar.gz