![]() ![]() In both cases, you can use a service or file that has root/sysadmin privileges to grab the password file (e.g. These files are accessible only by someone with root/sysadmin privileges. In the Windows operating system, passwords on the local system are stored in the SAM file, while Linux stores them in the /etc/shadow file. These systems very often use MD5 or SHA1 to hash the passwords. Hashes are one-way encryption that are unique for a given input. As a rule, passwords are stored as hashes. In general, passwords are not stored in clear text. I will do a tutorial on various replay attacks in the near future (look out specifically for my upcoming article on stealing the Facebook cookie to access someone's Facebook account). Sometimes these attacks can be much easier than cracking a complex and long password. For instance, if you can replay a cookie, session ID, a Kerberos ticket, an authenticated session, or other resource that authenticates the user after the password authentication process, you can access the password protected resource without ever knowing the password. In addition, sometimes you don't need a password to access password-protected resources. These ways might include insecure storage. In those cases, the hacker or forensic investigator can either employ greater computing resources (a botnet, supercomputer, GPU, ASIC, etc.), or they can look to obtain the password in other ways. 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.Īlthough some passwords are very easy to crack, some are very difficult. A username and password are used on computer systems, bank accounts, ATMs, and more. Passwords are the most widely used form of authentication throughout the world. The Importance & Methods of Password Cracking Then, one by one, I will show you how to use those principles and technologies effectively to crack or capture the various types of passwords out there. We will start with the basic principles of password cracking that are essential to ALL password cracking techniques, followed by some of the tools and technologies used. Password cracking is both an art and a science, and I hope to show you the many ways and subtleties involved. Now, I thought it might be worthwhile to begin a series on password cracking in general. I have already done a few tutorials on password cracking, including ones for Linux and Windows, WEP and WPA2, and even online passwords using THC Hydra. ![]()
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