1.4.11 Password Guessing
A 'black hat' will have in their toolkit several password guessing programs, which automate the process of rapidly testing many potential passwords for a given account. The most commonly used password guessing method is the dictionary attack (See 184.108.40.206)
Typically systems help guard against this by logging login attempts, perhaps flagging unsuccessful attempts in big red letters. Also make sure that if your system offers the availability to lock a user account after some number of unsuccessful login attempts, that you use it (somewhere around 3 to 5 seems to be the magic number of attempts usually tolerated before you should get worried that someones trying to guess a password).
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