iPhone App - Logon

Hello and thank you for reading, Currently the iPhone has a built-in feature to secure logging in. It is set On as the "Passcode Lock" feature from within Settings > General. It also has a time-out "Auto Lock" feature so that if the phone is left for a while, it logs off. I'm sure you know this functionality already. What I am looking to achieve is an application that does this. So rather than use the built in functionality of the iPhone, this would be a separate app altogether. It would launch immediately when the person turns on their iPhone and would ask the person to enter a code before they could get access to their iPhone menu etc. For Models 3GS and 4, Retail products (not JB) This project has two parts. i) as described above, no iPhone needed ii) for this you will need an iPhone because this part uses the camera I already have the code for this. It is just a matter of integrating. You can elect to do any combination of this project i, i+ii, ii thanks