Abstract The Internet of Things (IoT), serving as a principal technology enabling device interconnection, data amalgamation, and automation, boasts unrivaled ubiquity and convenience. Due to limited computing resources, small storage space, and restricted security features of IoT terminals, they are exposed to security risks such as information leakage, tampering, unauthorized access, and malicious control. To assure the security of data communication within the IoT framework necessitates the deployment of a Group Key Agreement (GKA), and the categorization of devices into specific groups. However, due to the dynamic structure of the IoT, which demands frequent device node addition and removal, might engender the constant need for group key updates. Traditional GKA lacks sufficient flexibility and response speed, resulting in additional computing and communication costs. Subsequently, group key updates could also pose a challenge to the forward and backward security provided by the GKA. In this work, we take a feasible step towards this challenge by proposing FADIC, a fine-grained attribute-based dynamic group key agreement scheme for IoT. We employ a server-assis
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