I don't see the sense in a 'security file' upload. It's easy for someone at your computer to get ahold of your file as well. Not to mention allowing _any_ type of file to be uploaded is only asking for trouble. You yourself are asking us to be trusting, when in all reality, some of us aren't.
Your idea is legitimate, but I don't think you have thought it through entirely. There are other alternatives such as the common, 'Recover your password', questions.