Hackers list of usernames and passwords code#

PBKDF2, bcrypt and scrypt are examples of these - scrypt in particular was specifically designed to be hard to parallelize due to massive RAM and RAM bandwidth requirements.

Hackers list of usernames and passwords code#

Remember that bitcoin mining is basically just brute-force 'hash reversal', so there are hugely efficient, hyper-optimized GPU and FPGA code readily available for SHA256 (which is a hugely popular password hashing algorithm).īecause of the ready availability of ultra-fast hashing technologies, best practice is to use a special ultra-slow, high-resource function instead of a conventional hash. I wouldn't be surprised, if there are even now ASICs in use by forensic services, data recovery companies, government black op units, etc. FPGAs are multiple orders of magnitude faster than GPUs. GPUs are thousands of times faster than a CPU. Remember, hashing is a easily parallelizable problem. Not really practical on a CPU, but technology moves on. You simply compute a ton of hashes based on 'likely' passwords until you find one that matches. However, it is still possible to brute force individual passwords one at a time. The presence of a random salt for each user means that it is not practical to use pre-calculated dictionaries for bulk cracking. So, the server might store 'user:BillG1 random:hgfws9rgb123kdyhf23bkivi823 hash: ' In this case, a random string is stored with the user name, and added to the supplied password before hashing. To really foil that the recommendation is to store a 'salted' hash. The hackers can then lookup the stolen hashes in their dictionary.

You can build a dictionary of 'likely' passwords and their hashes.

This way, if the hash is compromised, there is no simple way to reverse the hash process and recover the password.Įxcept that doesn't really work these days.

In this particular attack, the hackers used SQL injection, to cause the servers to return the list of usernames and passwords.īecause the password file/table is such an obvious high-value target, it is very strongly recommended that the passwords not be stored as is, but instead the hash is stored. Click to expand.The server stores the password in the database, and the database gets compromised.