What is salt? - Definition from Whatis.com

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salt

In password protection, salt is a random string of data used to modify a password hash. Salt can be added to the hash to prevent a collision by uniquely identifying a user's password, even if another user in the system has selected the same password. Salt can also be added to make it more difficult for an attacker to break into a system by using password hash-matching strategies because adding salt to a password hash prevents an attacker from testing known dictionary words across the entire system.

Related glossary terms: RSA algorithm (Rivest-Shamir-Adleman), data key, greynet (or graynet), spam cocktail (or anti-spam cocktail), fingerscanning (fingerprint scanning), munging, insider threat, authentication server, defense in depth, nonrepudiation

This was last updated in January 2002

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- Terry Ritter has posted a threaded discussion about the purpose of salt in password protection.
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