How can get original value from hash value?

No That's usually the point -- the process of hashing is normally one-way.

No. That's usually the point -- the process of hashing is normally one-way. This is especially important for hashes designed for passwords or cryptology -- which differ from hashes designed, for say, hash-maps.

Also, with an unbounded input length, there is an infinite amount of values which result in the same hash. One method that can be used is to hash a bunch of values (e.g. Brute-force from aaaaaaaa-zzzzzzz) and see which value has the same hash. If you have found this, you have found "the value" (the time is not cheap).

"Rainbow tables" work on this idea (but use space instead of time), but are defeated with a nonce salt.

Well, you can do it, but it's really inefficient and time consuming. +1 for the logical answer. – Blender Dec 2 '10 at 6:45.

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