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Salt is unique (usually random) data passed into a hash function for password storage to avoid the possible usage of rainbow tables or similar attacks. Salt will not help against dictionary or brute force attacks, as the salt is usually stored together with the hash.

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Injecting salt into PyCrypto KDF - useful?

Identical passwords will still get unique PBKDF2 hashes given a unique salt, regardless of which mechanism you use. I don't think explicitly adding the salt improves the security of this scheme. … I think it's safer to use the well tested and well understood construction of PBKDF2: dv = PBKDF2(password, salt) …
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Compare two hashes with different salt

You would have to be able to "undo" the hash with the given the salt to do what you want, which is obviously not something good functions let you do. …
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