Abstract
Message authentication using MAC has been proposed in order to prevent illegal attacks against CAN which is the standard of in-vehicle communication protocol. It also prevents replay attacks by inserting counter number in MAC. However, it is difficult to synchronize with counter number. Thus, message authentication cannot be performed correctly. Therefore, the counter synchronization mechanism is required. Regarding in-vehicle system, security verification is important as well as safety evaluation. This study proposes a new replay attack focused on the counter synchronization. This study also implements CAN communication with MAC. Experiments using implemented CAN communication show that the proposed replay attack succeeds. Experiment results indicate that the counter synchronization is a key technique to achieve secure in-vehicle system.
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