A Brute Force Attack is an attempt to guess a password by systematically trying different combinations of letter, symbols and numbers. Brute force attack continues until the combination match. Having a user authentication website can become the target of a brute force attack. Brute force attack is the most common and dangerous hacking method due to its high success rate. Before discussing some steps to stop brute force attacks, you should know all sorts of brute force attacks that are given below.