MD5 cracking with rainbow tables
Posted by creining | Filed under Security
MD5 Online Cracking is a website that will crack hashes but only at this time supports lowercase letters and/or digits up to a length of 8 characters. It uses RainbowCrack which is an implementation of the techniques described in Philippe Oechslin’s research into Making a Faster Cryptanalytic Time-Memory Trade-Off. RainbowCrack differs from a traditional brute force cracker that trys all possible plaintexts one by one against the hash by precomputing all possible plaintext -> ciphertext pairs in advance and storing them in a file deemed the “rainbow table”. This way, cracking a hash takes mere seconds. Philippe Oechslin also oversaw the Advanced Instant NT Password Cracker or How to crack a NT password in 5 seconds project which had an online demo but had to be pulled after one week of online time amounted to over a million hits. Also, it is worth mentioning that most *nix based systems use salted hashes which perturbs the encryption algorith in one of 4096 different ways therefore defeating attacks of the RainbowCrack type.
Comments are closed.