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In-vehicle communications are not designed for message exchange between thevehicles and outside systems originally. Thus, the security design of messageprotection is insufficient. Moreover, the internal devices do not have enoughresources to process the additional security operations. Nonetheless, due tothe characteristic of the in-vehicle network in which messages are broadcast,secure message transmission to specific receivers must be ensured. Withconsideration of the facts aforementioned, this work addresses resourceproblems by offloading secure operations to high-performance devices, and usesattribute-based access control to ensure the confidentiality of messages fromattackers and unauthorized users. In addition, we reconfigure existing accesscontrol based cryptography to address new vulnerabilities arising from the useof edge computing and attribute-based access control. Thus, this paper proposesan edge computing-based security protocol with fine-grained attribute-basedencryption using a hash function, symmetric-based cryptography, andreconfigured cryptographic scheme. In addition, this work formally proves thereconfigured cryptographic scheme and security protocol, and evaluates thefeasibility of the proposed security protocol in various aspects using theCANoe software.

EC-SVC: Secure CAN Bus In-Vehicle Communications with Fine-grained Access Control Based on Edge Computing