Cryptographic hash functions are designed to make these collisions incredibly difficult to find. From time to time, cryptographers find 'attacks' on hash functions that make finding collisions easier. A recent example is the MD5 hash function, for which collisions have actually been found. The MD5 message-digest algorithm is a widely used hash function producing a 128-bit hash value. Although MD5 was initially designed to be used as a cryptographic hash function, it has been found to suffer from extensive vulnerabilities. It can still be used as a checksum to verify data integrity, but only against unintentional corruption.
Nov 03, 2013 It is actually determining how to manipulate your password before hashing it. In addition, you are specifying hash mode 0, which does not use a salt to begin with. Actually, doing a quick check, it appears that your hash 31e95fc6b6b4191ce29220 is in-fact a plain MD5, and is NOT salted. So you can get rid of all the salt lines. This is the new and improved version of md5 engine.If you put an md5 hash in it will search for it and if found will get the result. This is the beta 0.23 of this engine. You can see the queue of the hashes here. Bots will run thourgh the queue and use various techniques to crack the hashes. The MD5 is threatened by the growing computing capabilities of supercomputers and processors capable of parallelizing hash functions. Thus, to complicate the search by the rainbow tables (databases), it is recommended to add salt (a prefix or a suffix) to the password. In this way, the precalculated tables must be calculated again to take account of the salt which systematically modifies all the fingerprints.
Active1 year, 3 months ago
If the salt in the hash is known to us, then is it possible to crack to extract the password from the hash? Dell inspiron windows 7 recovery. If yes, how?
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3 Answers
Hash functions are designed to go only one way. If you have a password, you can easily turn it into a hash, but if you have the hash, the only way to get the original password back is by brute force, trying all possible passwords to find one that would generate the hash that you have. Assuming the salt is very long, not knowing the salt would make it nearly impossible to crack (due to the additional length that the salt adds to the password), but you still have to brute force even if you do know the salt.
As an example, let's say that the password is 'secret' and the salt is '535743'. If the salt is simply appended to the end of the password, then the hash you'd be cracking would be a hash of the string 'secret535743'. Without knowing the hash, you'd have to try all possibilities until you reach 'secret535743', which would take quite a while due to its length (keeping in mind that real salts are much longer than this).
But if you know that the salt is 535743 and that it is appended to the end of the password, then instead of trying everything, you'd try 'a535743', 'b535743', 'c535743', etc. This greatly reduces the number of possibilities you have to try until you reach the correct string.
With that being said, it is generally quite rare to have a situation where you know the hash but not the salt since both are usually stored in the same place.
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If you know how the salt is used when hashing the clear text phrase this only makes it easier to brute force. The number of possibilities you have to check will be going dramatically down, since you only have to check for the phrase without the salt. Still if it is a long phrase with many different characters it will take a lot of time.
ChristiaanChristiaan
When password is not salted, and for example function md5 is used, then a potential hacker can go to online databases, and just a lookup there for a right password.
When password is salted, then one must brute force it, which is very time consuming. If attacker do not know salt, then in practice it's impossible to hack it at all.
Vilius AleksejunasVilius Aleksejunas
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