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Archive for July, 2009

PHP Security – Weak salt vulnerabilities

July 17th, 2009 No comments

Salt is good; but if the salt becomes unsalty, with what will you make it salty again?

- Jesus

Salting your hashes is a good thing.  It adds another level of protection to your hash, and prevents the effectiveness of rainbow tables should your hash get out.  It’s been standard practice to use a salt when storing passwords and similar information for almost 30 years now.  Using a weak salt can significantly reduce the protection it will give you.  Also, use of a salt should just be an additional level of protection to your hashes – not your only protection.  However, the use of a salt doesn’t suddenly mean that sharing your hashes with the world is a good thing.

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Categories: PHP Security