Sometimes hash algorithms will have weaknesses.

However, with a good hash algorithm and a sufficiently long password, you won't be able to learn the password this way before the sun dies out. With a good hash algorithm, this is the fastest way to figure out a particular hash. That is, try your salt with the password 'a', 'aa', 'aaa', 'aaa'. You might 'brute force' every possible input until you get the expected result. That said, there sometimes ways to find out the password. Nonetheless, it should be clear that you cannot reverse a hash like you can reverse (decrypt) encryption. In reality, hashes are much more complex, based on much harder math, and often are designed to prevent collisions - avoiding the scenario in my description where mod2 every 'odd' letter results in a '1' and every 'even' letter results in a '0'. letter numeric mod 2Īs you can see from the table, there's no way to get back to the original letter knowing only the hash value. 'b' could be represented as the value '98' and 98 mod 2 = 0. For example, 'a' could be represented as the value '97', and 97 mod 2 = 1. Consider hashing like finding the mod 2 result. In reality, much harder math problems are used, but this is the general idea. Decryption would be subtracting 1 from the number, so 'b' in the cipher text becomes 'a'. Encryption and decryption are opposites, while hashing has no opposite function.įor simplicity's sake, consider encryption to be like adding 1 to each character, so 'a' in the original text becomes 'b', 'b' in the original text becomes 'c', and so on. Hashing and encryption/decryption are two separate operations. Another obvious answer is because you forgot the password and are trying to regain access to your own data - though it is very unusual to have access to the hash but not the ability to just change the password if one is truly the rightful owner.Īs commenters have mentioned, you cannot decrypt a hash. Wanting to keep the password unchanged, but learn what it is and gain access to the underlying assets begs the question: why leave it unchanged? One obvious answer is to prevent the rightful owner from knowing that you have access. If you have business accessing the data that the password protects, then you probably have access to change the password, or you probably already know the password. Not wanting to change the password but wanting to learn it is generally very suspicious. I do not advocate breaking the law, and provide the publicly available information, below, for your general educational purposes. Be very careful to ensure that you know if you are violating the law and make an appropriate decision for whether or not to do so.

If the password owner doesn't work for your company then you may be running afoul of the law if you continue down this path.

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