But then, there are always easier ways to get to it. You said it was trivial. You'll get a good deal of respect from the worldwide security industry, and will probably make a fortune. In this case its the sync.
Time is the key.
Well of course. But that is like saying you can defeat a password system by entering the same password that the user know. It's true, but it doesn't help. The input to the algorithm is the secret. If it becomes known, the system is compomised.