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There are number of wordlists that have been compiled of common passwords.In recent years, many systems have been cracked and passwords captured from millions of users.These files are accessible only by someone with root/sysadmin privileges.In both cases, you can use a service or file that has root/sysadmin privileges to grab the password file (e.g. A dictionary attack is the simplest and fastest password cracking attack.This should usually be your first approach to attacking any password, and in some cases, it can prove successful in mere minutes. This means that even if you can get to the area or file that stores the password, what you get is an encrypted password.One approach to cracking this encryption is to take dictionary file and hash each word and compare it to the hashed password. A faster approach is to take a table with all the words in the dictionary already hashed and compare the hash from the password file to your list of hashes. Brute force is the most time consuming approach to password cracking. Brute force password cracking attempts all possibilities of all the letters, number, special characters that might be combined for a password and attempts them.
A username and password are used on computer systems, bank accounts, ATMs, and more.
By using these already captured passwords, you are likely to find at least a few on the network you are trying to hack. They don't expect to be able to crack every password, but with a well-developed strategy, they can crack most passwords in a very short amount of time.
Many newbies, when they start cracking passwords, simply choose a tool and word list and then turn them loose. The key to develop a successful strategy of password cracking is to use multiple iterations, going after the easiest passwords with the first iteration to the most difficult passwords using different techniques for each iteration.
The ability to crack passwords is an essential skill to both the hacker and the forensic investigator, the latter needing to hack passwords for accessing the suspect's system, hard drive, email account, etc.
Although some passwords are very easy to crack, some are very difficult.
As much as we think each of us is unique, we do show some common patterns of behavior within our species.