Securing Data by Steganography on Small Devices

Steganography is a well known, and long standing, technique to hide data into data. The actual small devices, such as the smartphones, provide a complete set of capabilities to cipher and decipher text into pictures. In this paper we propose an application that enables the user to exploit the capabilities of smartphones to hide and retrieve data into pictures taken by means of the onboard camera. The limited computational power and storage capacity of a small device are enough to allows their user to take advantage of a sophisticated technique such as the steganography. By means of our application a smartphone becomes a self-contained device that enables the user to easily hide, store, and retrieve secure data. Moreover, those data can be securely sent and received by means of the Multimedia Messaging Service, MMS, a common technique to exchange images in the actual scenario of cellular telephony.