Whilst I think it would be useful, you're not teaching the more general lessons (such as not relying solely on security by obscurity). I suspect the kind of pe

Whilst I think it would be useful, you're not teaching the more general lessons (such as not relying solely on security by obscurity). I suspect the kind of person who left in that backdoor would, after going through the course, simply make a slightly harder-to-find backdoor. (If anything, they might be more likely because they think they've taken into account THE vulnerability, when it is only a vulnerability).