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In this paper, we propose a novel method to detect encrypted botnet traffic. During the traffic preprocessing stage, the proposed payload extraction method can identify a large amount of encrypted applications traffic. It can filter out a large amount of non-malicious traffic, greatly improving the detection efficiency. A Sequential Probability Ratio Test (SPRT)-based method can find spatial-temporal correlations in suspicious botnet traffic and make an accurate judgment. Experimental results show that the false positive and false negative rates can be controlled within a certain range. 相似文献