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SCANet: Sensor-based Continuous Authentication with Two-stream Convolutional Neural Networks
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DOI：10.1145/3397179.png)
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Continuous authentication monitors the security of a system throughout the login session on mobile devices. In this article, we present SCANet, a two-stream convolutional neural network-based continuous authentication system that leverages the accelerometer and gyroscope on smartphones to monitor users' behavioral patterns. We are among the first to use two streams of data- frequency domain data and temporal difference domain data-from the two sensors as the inputs of the convolutional neural network (CNN). SCANet utilizes the two-stream CNN to learn and extract representative features and then performs the principal component analysis to select the top 25 features with high discriminability. With the CNN-extracted features, SCANet exploits the one-class support vector machine to train the classifier in the enrollment phase. Based on the trained CNN and classifier, SCANet identifies the current user as a legitimate user or an impostor in the continuous authentication phase. We evaluate the effectiveness of the two-stream CNN and the performance of SCANet on our dataset and BrainRun dataset, and the experimental results demonstrate that CNN achieves 90.04% accuracy, and SCANet reaches an average of 5.14% equal error rate on two datasets and takes approximately 3 s for user authentication.
Keyword:
Continuous authentication
accelerometer and gyroscope
two-stream convolutional neural network (CNN)
one-class support vector machine (SVM)
equal error rate (EER)
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