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Since salts are different in each password, they also protect commonly used passwords or those who use the same password on several sites, by making all salted hash instances for the same password different from each other. Since salts do not have to be memorized by humans they can make the size of the rainbow table required for a successful attack prohibitively large. The resulting output (but not the original password) is stored with the salt in a database. The salt and the password are concatenated and then processed with a cryptographic hash function. To salt a password hash, a new salt is randomly generated for each password. The goal of salting is to defend against dictionary attacks or attacks against hashed passwords using a rainbow table.
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Password hash salting is when random data – a salt – is used as an additional input to a hash function that hashes a password. Salted secured hash algorithm helps protect password hashes against dictionary attacks by introducing additional randomness. Payment Card Industry Data Security Standard.Health Insurance Portability and Accountability Act.Center of Internet Security Controllers.National Institute of Standards and Technology.
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Defense Federal Acquisition Regulations Supplement.Salted Challenge Response Authentication Mechanism.Challenge Handshake Authentication Protocol.You can build a salted hash out of a MAC by using PBKDF2, which basically applies the MAC a lot of times (to make it slower). Also, as you said, salts are not assumed to be secret. Because they are intended to deter brute-force attacks, they are intentionally designed to be slow. System for Cross-Domain Identity Management Salted hashing has a completely different purpose, which you noted.Security Information and Event Management.Elliptic Curve Digital Signature Algorithm.