Then again, if it we're expected to judge the security of the system we need to see the PHP code. No point in advertising it to users, obviously (the only ones who care would be exactly the ones who shouldn't be told the details), but in the current situation it doesn't say much for the author's confidence in the code's robustness if it can only be considered secure for as long as no-one actually knows what it does.
But then that would be better conducted in the Code Critique forum.