Methods, computer-readable media, and systems for enhancing useability of mobile devices that securely store data. An input to transfer a computer software application executing on a mobile device from a foreground state of the mobile device to a background state of the mobile device is received. In response, noise data based on application data associated with the application is generated. Both the application data and the noise data are encrypted using the same encryption mechanism, but using different keys. When another input to transfer the application from the background state to the foreground state is received, then the encryption mechanism is executed on the application data and the noise data using a key requested in response to the other input. The application is transferred to the foreground state if the received key matches the key with which the application data was previously encrypted. Other items of data are discarded.