Hi guys/girls Check out this :
"There is another authentication system known as One Time Passwords (OTP). As the name suggests, you can only use a password once; you aren't allowed to reuse it. An OTP system ensures that a discovered password is useless to the person who discovers it. This can provide a bit more security in a world that contains password crackers, packet sniffers, and keyloggers. "

The link http://www.onlamp.com/lpt/a/3173


Cheers