CNN-LSTM Powered Network IDS for Adaptive Cyber Defence

A Network IDS (NIDS) is devised to examine network traffic to detect signs of malicious behaviour or violations of protection policies. It is an essential piece of equipment in the fight to improve cybersecurity via early threat detection and response. Existing machine learning approaches, though efficient, are generally bogged down by significant manual feature engineering, which restricts their flexibility to adapt to dynamic attack scenarios. Deep learning approaches, with the ability to automatically learn high-level features, provide a robust alternative to designing effective IDS. This work proposes a novel hybrid deep learning architecture to synergistically integrate CNN and LSTM networks for tackling the complexity of network intrusion detection. The CNN module performs well in detecting spatial patterns of network traffic data, and the LSTM module incorporates temporal dependencies to facilitate exhaustive analysis of sequential attack patterns. To improve model efficiency and avoid overfitting, batch normalization and dropout layers are strategically integrated in the architecture. The model is extensively tested on three diverse datasets, CIC-IDS2017, UNSW-NB15, and NSL-KDD, covering a broad range of contemporary attack types. Experiments are performed for binary and multiclass classification tasks, and performance metrics are evaluated based on a confusion matrix. Key performance metrics, like false alarm rate, accuracy, F1 score and detection rate, define the model’s performance in intrusion detection with high accuracy while avoiding a high false positive rate. The outcome proves the model’s robust performance across diverse network environments, varying from wired to wireless networks, and its applicability in detecting known and novel threats. By tapping the power of automated feature extraction and sophisticated neural network design, the work critically contributes to a scalable and efficient solution to existing network security, opening the door to real-time, adaptive intrusion detection across complex digital terrain.