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Brute force
From NetSec
A brute force attack, or brute forcing is a highly primitive technique used to obtain authentication credentials by repeatedly guessing based on set parameters such as estimated length and characters used. The effectiveness of a brute-force attack is directly and exponentially related to the difficulty of the password. For instance, a single digit password of 0-9 would take a maximum of 10 tries, whereas a double digit would take 100, rather than 20. Similarly credentials which are longer or have a larger character set through the addition of special characters are exponentially more secure to this method of attack.
External Links
http://www.hoobie.net/brutus/ - a popular brute forcer for Windows.
