Lightweight attribute based encryption scheme for mobile cloud assisted cyber-physical systems

Protecting data in Cyber-Physical Systems (CPS) has been a longstanding challenge. The tradition Attribute Based Encryption (ABE) is known for its high computation load which creates a significant challenge for resource constrained mobile devices. In this paper, we propose a Lightweight Attribute Based Encryption Scheme (LABE) for mobile cloud-assisted CPS based on a proxy service architecture and a new ciphertext policy ABE. In particular, mobile devices will solely perform symmetric encryption by joining authentication and encryption proxy services encapsulated in RESTful. Encryption shall not need pairing and then ciphertext can be decrypted with one pairing. Security analysis shows that the proposed LABE is secure with fine grained access control and users revocation capability. The computation complexity shows that the proposed scheme imposes low overhead on mobile devices and performs very well in mobile cloud-assisted CPS.