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    <p>I believe your scheme is adequate, but it can be improved upon a little bit.</p> <p>It seems to me that you have the beginnings of a salting scheme here, with your EncryptionKey that you have in your app.config file. However, for best security practices, generally people use a different salt for each password, and store the salt alongside the hash in the database. </p> <pre><code>class MyAuthClass { private const int SaltSize = 40; private ThreadLocal&lt;HashAlgorithm&gt; Hasher; public MyAuthClass () { // This is 'ThreadLocal' so your methods which use this are thread-safe. Hasher = new ThreadLocal&lt;HashAlgorithm&gt;( () =&gt; new HMACSHA256(Encoding.ASCII.GetBytes(_configurationProvider.PasswordEncryptionKey) ); } public User CreateUser(string email, string password) { var rng = new RNGCryptoServiceProvider(); var pwBytes = Encoding.Unicode.GetBytes(password); var salt = new byte[SaltSize]; rng.GetBytes(salt); var hasher = Hasher.Value; hasher.TransformBlock(salt, 0, SaltSize, salt, 0); hasher.TransformFinalBlock(pwBytes, 0, pwBytes.Length); var finalHash = hasher.Hash; return new User { UserName = email, PasswordHash = finalHash, Salt = salt }; } </code></pre> <p>With a scheme such as this, your passwords are made more complex because if an attacker happened to get the hashes, he'd have to also guess the salt during a brute-force attack. </p> <p>It's the same philosophy as your EncodingKey in your configuration file, but more secure since each hash has its own salt. Checking entered passwords is similar:</p> <pre><code> public bool IsPasswordCorrect(User u, string attempt) { var hasher = Hasher.Value; var pwBytes = Encoding.Unicode.GetBytes(attempt); hasher.TransformBlock(u.Salt, 0, u.Salt.Length, Salt, 0); hasher.TransformFinalBlock(pwBytes, 0, pwBytes.Length); // LINQ method that checks element equality. return hasher.Hash.SequenceEqual(u.PasswordHash); } } // end MyAuthClass </code></pre> <p>Of course, if you'd rather store the hashes as strings rather than byte arrays, you're welcome to do so.</p> <p>Just my 2 cents!</p>
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    1. COThanks for the input and code sample! I'll do the salting.
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