Unsupervised Anomaly Detection in NSL-KDD Using $β$-VAE: A Latent Space and Reconstruction Error Approach
This work addresses intrusion detection for network security, but it is incremental as it applies existing methods to a standard dataset.
The paper tackled unsupervised anomaly detection in network traffic using β-Variational Autoencoders on the NSL-KDD dataset, comparing latent space distance and reconstruction error methods, with results showing the latent space approach is effective for classification.
As Operational Technology increasingly integrates with Information Technology, the need for Intrusion Detection Systems becomes more important. This paper explores an unsupervised approach to anomaly detection in network traffic using $β$-Variational Autoencoders on the NSL-KDD dataset. We investigate two methods: leveraging the latent space structure by measuring distances from test samples to the training data projections, and using the reconstruction error as a conventional anomaly detection metric. By comparing these approaches, we provide insights into their respective advantages and limitations in an unsupervised setting. Experimental results highlight the effectiveness of latent space exploitation for classification tasks.