I agree with your first paragraph: It is possible for there to be a "fix" where knowledge of its inner workings would expose an easy way to prevent the fix from

I agree with your first paragraph: It is possible for there to be a "fix" where knowledge of its inner workings would expose an easy way to prevent the fix from being applied. Of course, what I said would still apply: I am less confident that such a thing would be resistant to compromise using other methods. So, if they have this supersecurity patch to put out, after it has been installed they should be eager to tell the world how the systems are now secured.