HMAC is mostly useful when you want to verify that some text hasn't been altered. The client sends message + HMAC(message, secret) and then the server (which al

HMAC is mostly useful when you want to verify that some text hasn't been altered. The client sends message + HMAC(message, secret) and then the server (which also knows the secret) can verify that no-one has changed the message. Dunno if it helps anything when it comes to salting. Anyone else who knows?