An SDKEY Data Protection and Sharing Scheme with Attribute-Based Encryption for Smartphone

Android system attracts many malicious applications to steal sensitive data. Not only in storing data, it is also easy to get data leaked while sharing. SDKEY device is an external compute system with Independent arithmetic processor. In this paper. First, we present and implement a method to store and share data safely with cipher policy attribute-based encryption between Android phones, and it is useful in Instant messaging and file managing. Second, we design a security file structure to manage data efficiently. Third, we design a kind of dual-authentication login scheme using both SDKEY and PIN for booting Android OS. Finally, a solution on transparent encryption storage for sensitive message like SMS is proposed. Besides, we also develop a prototype system based on all above solutions in this paper, the performance and security of system are proved and verified from several aspects.