View Single Post
Old 2007-11-23, 20:18   #2
axn
 
axn's Avatar
 
Jun 2003

4,789 Posts
Default

Quote:
Originally Posted by jasong View Post
The passcode is 64 bits, meaning 2^64 combinations, but there's a bug in the software. Each time you attempt a guess, you find out if the number of bits that are correct is odd or even
The bug gives exactly one bit of information -- namely, the parity of the passcode. Additional tries will not give any additional information. So the only way you'll ever crack a passcode is if you get the whole code right at one go and the door opens. So your best strategy is to join the guards and watch some porn ;)
axn is online now   Reply With Quote