Computers can figure out your password by trying all possible combinations of letters and numbers. A brute force attack usually begins with a dictionary attack – the computer tries every word in the dictionary as your password. This would take a human a long time to attempt, computers can do it at speeds of up to a million passwords per second. Should a dictionary attack prove unsuccessful, all possible combinations of letters, numbers and punctuation is attempted as your password. This method would inevitably find your password sooner or later, the only barrier is time.

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