A NOVEL APPROACH FOR FLEXRAY PROTOCOL WITH CONFIDENTIALITY AND AUTHENTICITY

Abstract

Current FlexRay protocol is only a pure communication network without security mechanism. It may cause to leak sensitive information of critical components. To prevent this, we focused on enhancing security for FlexRay protocol in this thesis. First, we enhanced confidentiality and authenticity for FlexRay using AES-CCM (32-bit MAC). The design assures that FlexRay message is transmitted in ciphertext and consumed with authenticity verification. The result shows that possible attacks cannot compromise this enhanced design. Second, we optimized authenticity for FlexRay message using AEGIS (64-bit MAC). This design adapts AEGIS for dynamic segment with a 64-bit MAC which provides higher level of authentication assurance compared to the previous design with AES-CCM (32-bit MAC). The benefits of this design are: shorter latency, higher security and real-time computation. We implemented AEGIS within a two-node FlexRay network and verified correctness of this design.