CBF-IDS: Addressing Class Imbalance Using CNN-BiLSTM with Focal Loss in Network Intrusion Detection System

The importance of network security has become increasingly prominent due to the rapid development of network technology. Network intrusion detection systems (NIDSs) play a crucial role in safeguarding networks from malicious attacks and intrusions. However, the issue of class imbalance in the datase...

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Bibliographic Details
Published in:Applied sciences 2023-11, Vol.13 (21), p.11629
Main Authors: Peng, Haonan, Wu, Chunming, Xiao, Yanfeng
Format: Article
Language:English
Subjects:
Accuracy
Algorithms
Behavior
bidirectional long short-term memory
class imbalance
Classification
convolutional neural network
Datasets
Deep learning
Detectors
Feature selection
focal loss
intrusion detection system
Intrusion detection systems
Machine learning
Neural networks
Performance evaluation
Safety and security measures
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Summary:The importance of network security has become increasingly prominent due to the rapid development of network technology. Network intrusion detection systems (NIDSs) play a crucial role in safeguarding networks from malicious attacks and intrusions. However, the issue of class imbalance in the dataset presents a significant challenge to NIDSs. In order to address this concern, this paper proposes a new NIDS called CBF-IDS, which combines convolutional neural networks (CNNs) and bidirectional long short-term memory networks (BiLSTMs) while employing the focal loss function. By utilizing CBF-IDS, spatial and temporal features can be extracted from network traffic. Moreover, during model training, CBF-IDS applies the focal loss function to give more weight to minority class samples, thereby mitigating the impact of class imbalance on model performance. In order to evaluate the effectiveness of CBF-IDS, experiments were conducted on three benchmark datasets: NSL-KDD, UNSW-NB15, and CIC-IDS2017. The experimental results demonstrate that CBF-IDS outperforms other classification models, achieving superior detection performance.
ISSN:2076-3417
2076-3417
DOI:10.3390/app132111629