creating programms into a usb-stick

I would like something simple... I would just like to create a 'security' programme/software(inside a usb stick), that will be able to protect and secure my usb stick's files and documents. I want the only way to read-delete-add-change the usb stick's files will be by putting a log in name and code. That name and code, will appear by the time I input the usb stick to any computer device(/or laptop obviously).