Jay,

> I didn't want to spell out precisely what the problem was, but you did.

I can not see a secret on it. I assumed only it returns always a constant serial number. And today for security it was always needed to have an encription algorithm inside.

Today all constant keys unsecure.
Especially a 1 wire signal can easy be recorded. And all the timing specifications are published.

Thus also why modern electronic keys always build with a micro inside, which can execute a user programmed secret key algorithm.


Peter