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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What effect, if any, does the salt have on the three types of hashing attacks?

I am interested in analyzing how adding a salt to our hashed passwords affects the three types of attacks we can use .The three types of attacks are as follows: ...
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RSA-PSS salt size in certificate

In RFC 4055, the signature RSAPSS algorithm has the following ASN 1 parameters: ...