Hello!
We looked through your project description and we are able to develop Blackberry 10 native app. The app will be locked with password and there will be message expiration. Of course, the app will be on P2P or XMPP protocol.
Have you got any specifications docs? We really want to develop a perfect Blackberry app for you so lets discuss all the project details.
We are Smichrissoft - professional software developers. We focus on website development, E-commerce systems development, mobile apps, web design, and etc. We work in this sphere more than 3 years so we can offer you the best solutions.
Feel free to write us any time,
Best regards,
Smichrissoft.