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Can you decrypt a one way hash?
Hashes can’t be decrypted. A hash is a one-way function, which means that we can’t get back the inputs given the outputs. Any given hash function takes an input of variable length and gives an output of fixed length. Since the outputs can be of a fixed size, it is possible that two hashes might eventually repeat.
Will a hash always be the same?
Hashing is simply passing some data through a formula that produces a result, called a hash. That hash is usually a string of characters and the hashes generated by a formula are always the same length, regardless of how much data you feed into it.
Is it possible to revert hash?
Hashing is a mathematical operation that is easy to perform, but extremely difficult to reverse. (The difference between hashing and encryption is that encryption can be reversed, or decrypted, using a specific key.)
Is it possible to UN-hash a MD5 hash?
You cannot un-hash an MD5 hash. There is no way of “reverting” a hash function in terms of finding the inverse function for it. As mentioned before, this is the whole point of having a hash function. It should not be reversible and it should allow for fast hash value calculation.
Is there a way to always have a perfect hash function?
One way to always have a perfect hash function is to increase the size of the hash table so that each possible value in the item range can be accommodated. This guarantees that each item will have a unique slot. Although this is practical for small numbers of items, it is not feasible when the number of possible items is large.
Is it possible to hash to the same value?
So there are actually an infinite number of possibilities for data that would hash to the same value. The thing that makes hashes interesting is that it is incredibly difficult to find two pieces of data that hash to the same value, and the chances of it happening by accident are almost 0.
Is it possible to get a password from a hash?
Once a piece of data has been run through a hash function, there is no going back. You can’t – in theory. The whole point of a hash is that it’s one way only. This means that if someone manages to get the list of hashes, they still can’t get your password.