Authentication method, device and system

The embodiment of the invention provides an authentication method, device and system, and relates to the technical field of communication, an authentication server can obtain information of a plurality of nodes or information of a replacement node in a vehicle-mounted system, and authenticates the plurality of nodes according to the information of the plurality of nodes, or authenticates the replacement node according to the information of the replacement node. After the authentication is passed, the authentication server can also send an identifier of a child node of the node, key information of the child node of the node, an identifier of a father node of the node and key information of the father node of the node to the node of the vehicle-mounted system, so that when the vehicle-mounted system is started, the node and other nodes of the vehicle-mounted system are authenticated; therefore, the safety of the vehicle-mounted system is improved. 本申请实施例提供认证方法、设备及系统，涉及通信技术领域，认证服务器可以获取车载系统中的多个节点的信息或更换节点的信息，并根据多个