Most deviants are using Brute Force, variations as well, to crack passwords, and other encrypted info.
An 8 digit password can be cracked in 6 hours or less. This has been around for a decade or so.
There are now counter measures one can download to stop Brute Force
A 12 alphanumerical password, can be beaten in 83.5 days. Throw in some symbols, and you will make them work upwards of a year or much more.
Once the attack has taked a certain amount of lengthy time, without sucsess, it will stop and move on, to another victim
http://www.computerweekly.com/answer/Techniques-for-preventing-a-brute-force-login-attack