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In this paper, we address the problem of authenticating transmitters in millimeter-wave (mmWave) multiple-input multiple-output (MIMO) communication systems, and propose a location verification scheme based on multi-dimensional mmWave MIMO channel features. In particular, we first examine the mmWave MIMO channel features in terms of azimuth angle of arrival (AAoA), elevation angle of arrival (EAoA), and path gain, and then extract these fine-grained channel features through the maximum-likelihood (ML) estimation method. Based on the extracted feature parameters, authentication validation is cast in the framework of hypothesis testing theory. We also derive the analytical expressions for the typical false alarm and detection rates by using the likelihood ratio test and thus the statistical performance is analytically established. Finally, extensive numerical results are provided to demonstrate the performance of the proposed authentication scheme.

The massive heterogeneous devices and open channels of the Internet of Things (IoT) lead to low efficiency and privacy leakage in the authentication process, which brings great challenges to identity authentication. This paper focuses on the anonymous authentication between the IoT edge device and the cloud server. In this work, we first propose a novel lightweight anonymous authentication protocol (LAAP) to meet security and efficiency requirements. Especially, the proposed protocol uses dynamic pseudonyms to prevent the traceable attacks caused by fixed identity identification and also uses symmetric encryption to optimize the server’s search for anonymous device information, and the time complexity is reduced from O n to O 1 . Then, the formal security analysis and informal security analysis are provided to prove the security of the proposed protocol. Finally, extensive numerical results indicate that the proposed LAAP protocol is superior to the benchmarks in terms of computing overhead and communication overhead, while the storage overhead is consistent with the lowest level among other protocols.