u/Calkhasin r/C_Programming • Recommends
On “How does one protect against reverse engineering ?”
Not exactly relevant, and there's no C, but this is one of the best introductions to reverse engineering I have seen. Check it out!
link to this video
The interesting part is how long it took to break this system. As far as I know it was not broken for decades, but that might be a lack of professional interest.