3 ms·
Not so. If it's a 4 digit combination, it's already n!, so 24 combinations, which is enough for a good system to lock up and automatically call the police. If i
by antonb2011 14y ago
Not so. If it's a 4 digit combination, it's already n!, so 24 combinations, which is enough for a good system to lock up and automatically call the police. If it's more, then it's gonna grow as n!/k!l!m!... where, k, l, m... are the numbers of repeated digits, but still it's more than enough to know that someone's trying to brute force the system.
- FreeFull 14y agoThe point is that the attacker watches from a distance, and using the rough hand movements he/she has seen can reduce that 24 combinations significantly.
- sageikosa 14y agoHence why I prefer the smaller keypads on ATM machines, so I can minimize my finger movements. Having one keycode for the supermarket is also a good way for disgruntled former employees to act malfeasantly.
- shawabawa3 14y ago> so 24 combinations, which is enough for a good system to lock up and automatically call the police 24 is nowhere enough 1. Having a roughly 10% chance of getting it after 2 tries isn't exactly secure. 2. An attacker could just try 1 or 2 combinations per day
- stcredzero 14y agohttp://mindyourdecisions.com/blog/2011/01/27/game-theory-and-probability-of-iphone-passwords/ http://mindyourdecisions.com/blog/2011/01/27/game-theory-and...