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Shay Ben Moshe's Blog: Hashing Passwords Properly

Note: This article was originally published at PHPDeveloper on 13 May 2011.
PHPDeveloper

Shay Ben Moshe has a new post to his blog looking at a method he's come up with for hashing passwords the proper way and saving them to a database for future checking. His encryption methods of choice crypt and a random salt generator.

The easy and common solution for this particular problem is to use an one-way hash function, such as md5 and sha1, which takes the password and encrypts it. Unfortunately, this method is not as strong as you may think. [...] We can protect our password from rainbow tables and similar attacks by using salts.

He talks about storing passwords in a database (never as plain text!) and what rainbow tables are and how they can make it simple for a user to break a poorly hashed value. He shows how to use the crypt function together with the sha512 hashing tool to make a salt.