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10

So in general, isn't this equivalent to what Bcrypt and PBKDF2 do in terms of password storage security? PBKDF2, yes, pretty much. The only real difference is that salt/password are used the other way around, with the password mixed in at every step. Bcrypt, however, is different. In your case an attacker only needs a small amount of memory compared ...


4

Although your scheme is secure - especially with a random key of 32 bytes or higher - it won't offer any benefit over HMAC. It's therefore not recommended to use such a scheme. Also note that `bcrypt has been designed for key stretching which is deliberately not efficient. You have ample entropy in your key so there is no need for key stretching.


3

The question is how much is this schema secure? Not significantly more secure than sha256(m + k) is and may be less secure. An attacker who could arrange a collision for that would trivially also get a collision for the bcrypt hash of that, regardless of the salt value. While SHA-256 is collision resistant, there are MACs that have better bounds, like ...



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