Password crackers typically come in two flavors: dictionary based and brute force.
A dictionary-based password cracker contains a database filled with words from the dictionary, common names and often catch phrases from popular movies. You have probably heard people say that in order to have a secure password, you need to mix random numbers, letters and symbols. Doing so makes the password immune to dictionary-based cracks because random character strings would not be in the cracking utility's dictionary.
A brute-force cracker would be used to crack passwords consisting of random character strings. Brute force works by trying every possible combination of numbers, letters and symbols until the password is revealed.
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