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POWhen deriving keys from passwords, should I store the key or use the key to encrypt?
 

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  1. POWhen deriving keys from passwords, should I store the key or use the key to encrypt?
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    <p>The following quote has made me question what I thought I knew.</p> <blockquote> <p>"Now consider bcrypt. It uses Blowfish to encrypt a magic string, using a key "derived" from the password. Later, when a user enters a password, the key is derived again, and if the ciphertext produced by encrypting with that key matches the stored ciphertext, the user is authenticated. The ciphertext is stored in the "password" table, but the derived key is never stored."</p> </blockquote> <p>I was under the assumption that you store the hash of the salted password.</p> <pre><code> Where: - KDF = a key derivation function such as pbkdf2 or bcrypt - salt = a unique 16 byte salt - password = the password the user entered - saltedPassword = the password appended to the salt - hashedSaltedPassword = KDF(saltedPassword) - USER = a database table where usernames and passwords are stored&lt;br USER.Password = hashedSaltedPassword USER.PasswordSalt = salt </code></pre> <p>Is this correct or am I way off?</p>
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    1. USAndrew Hoffman
    1. USAndrew Hoffman
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    1. COThe hash of the salted password is the cipher text.
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      1. USMichael Zajac
 

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