Hydra is an open-sourced dictionary password cracking, or also known as dictionary attack, released from THC.
Dictionary Attack Defination from http://lastbit.com/
Dictionary Attack uses a dictionary. Password Crackers will try every word from the dictionary as a password. A good dictionary (also known as a word list) is more than just a dictionary, e.g. you will not find the word "qwerty" in the ordinary dictionary but it will surely be included into a good word list. Indeed, this combination of characters is commonly used as a password.
