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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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Why do some key derivation functions (like PBKDF2) use a salt?
password>, <salt>) -> <hash>
And both the <hash> as well as the <salt> that was used are then stored (in a database, for example). … )
What purpose does this salt serve? …