Well, the only way that's possible is if the other guy who sent the packets had the same secret key.

Once the challenger received that reply, it would also have the secret key.

Then, you can probe a card, learn how it works and get the secret keys.

There wasn't any place to put a secret key I didn't have.

The data stream is scrambled with an 48-bit secret key, called the control word.

See, the point of the third party is they know your secret key.

It also includes the name of the secret key that was used to sign the request.

But it's difficult to get the shared secret key to the other person (or people) in the first place.

There isn't a secret key, some trick that will do it.

What I meant was, are you familiar with the idea that the universe has a secret key?