Behavior-Aware Access Control for IoT Networks Using Lightweight Machine Learning at the Gateway Level
The growing amount of heterogeneous devices with scarce resources is compromising the security of the Internet of Things (IoT), as they are more likely to adapt to a fixed and identity-based access control. Conventional security systems tend to assume that once a device is authenticated, the network may be exposed to credential theft, firmware, and insider abuse. In this study a behavior-sensitive access control solution is presented, which integrates lightweight supervised Machine Learning (ML) on the IoT gateway to provide dynamic authorization. Unlike the traditional passive intrusion detection models, the proposed framework uses a Supervised Random Forest model to process real-time statistical feature summaries in terms of mean, standard deviation, and sparsity of the IoT telemetry data. The method converts the output of anomaly detection directly into access (full, restricted or blocked) levels. The system was implemented on a Flask-based gateway and tested with ToN-IoT benchmark dataset. The results of the experiments show an anomaly-class recall of 0.9986 (99.86%) with 91,169 correctly detected attack and 125 false negatives among the 91,294 attack instances, for a security-oriented Zero Trust profile. As an example, when rounded to two decimal places, this value is 1.00, but the unrounded value is reported so as not to suggest 100% detection. The enforcement layer focuses on reducing risk and removes or filters out requests that were determined to be malicious or unauthorized in the scenarios. The architecture is designed to provide low latency through feature extraction and inference on the edge, which provides data privacy because telemetry processing is locally done without relying on the cloud.