Well, if you are able to predict that random voltage generator (we have seen recently some failures in pseudo-random generators that allow attackers to predict

Well, if you are able to predict that random voltage generator (we have seen recently some failures in pseudo-random generators that allow attackers to predict next numbers) we can correlate again time with data. So now you have to ensure your random generator is truly random, and not biased at all. For every weird property you try to use to obfuscate the computation, there is some kind of counter to try to de-obfuscate it. That's why crypto is really hard. If you really want to succeed, the only way is use as many tricks as possible, in order to make the attack really hard, hoping to discourage the attacker into doing something more productive with his life.