Comment by Nathanba

I understand that we may never see the secret knock but shouldn't we have the door and what's behind it now? Doesn't this mean that the code is quite literally too hard to figure out for a human being? It's not like he can send a full new executable binary that he simply executes, then we'd see that the door is e.g the exec() call. Honestly this attempt makes me think that the entire c/c++ language stack and ecosystem is the problem. All these software shenanigans should not be needed in a piece of software like openssh but it's possible because it's written in c/c++.