Abstract
The smart water monitoring system (SWMS) integrated with IoT provides improved services to the society with minimal effort. At the same time, IoT connectivity brings various active, passive, and physical security threats to the system. The conventional cryptosystems are infeasible for resource-constrained IoT devices and susceptible to physical attacks. Physically unclonable function (PUF) emerged as a low-cost, convenient hardware security primitive. In this work, we have proposed a secure (against active, passive, and physical attacks) authentication and key sharing protocol for the SWMS with low overhead. The extensive security analysis illustrates the durability of the protocol. The performance analysis shows the proposed protocol's minimal computation, communication overhead, and resource utilization. Using a mathematical PUF model (i.e., soft model) reduces the server-side burden of storing PUF challenge-response pairs. Moreover, the protocol deals with the noisy PUF responses to maintain the correctness and accuracy of the authentication process. Finally, a comparison with the existing works establishes the proposed protocol's superiority in the SWMS.
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