Text and file encryption application for blackberry using cipher feedback 8-bit mode

BlackBerry is not just an ordinary smartphone which rich in its multimedia features. BlackBerry also has very reliable internet services, include BlackBerry Messenger, e-mail, other instant messaging, and other internet service that Blackberry Internet Service (BIS) covers. However, there's an open question that all services that go through BIS is safe or not; considering the data includes text and files which is sent through BIS have to pass through the main server which is located in Canada. Therefor in this paper we chose to make software that can encrypt and decrypt text and even files, which will be sent through BlackBerry's internet or just to be stored in the BlackBerry device.