Based on the blockchain empowered distributed security scheme, the block producer selection, and onboard blockchain client handoff decision problem are studied. The client that runs the blockchain program not only acts as blockchain nodes to provide distributed key management for the CBTC system, they also work as a relay node to authenticate the communication between train control nodes in CBTC systems. To improve system security, in this paper, we deploy a blockchain in CBTC systems. The existing identity authentication mechanisms in CBTC adopt a centralized key management system sensitive to single-point failures. Identity authentication is an effective approach to improve system security. The adoption of wireless communication and network techniques makes the CBTC systems more vulnerable to cyber-attacks. The Communication Based Train Control (CBTC) system ensures the high efficiency and orderliness of trains and is widely used in urban rail transit networks.
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