hash - Password + Salt + SecretSauce? Helpful, or just a little obscurity? -

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standard password security involves generating random salt each user, somehow combining salt password , hashing them together, , storing both hash , salt in database.

what if, instead of hash($salt . $password), added in passphrase well, stored in source code or in server config file:

$secret_sauce = 'tehb%l1yg*@t$g2uff'; // perhaps imported config file $hash = hash($salt . $secret_sauce . $password);

does add added benefit, or thin layer of security obscurity applied top?

for password files little obscurity added on top.

however, scheme called "keyed hash" , can used symmetric (shared-secret) signatures: if have such hash, , input data, can sure signature created knows secret bit. of course, unlike public-key signature, cannot verify without knowing secret key.


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