Date of Submission

Spring 5-6-2020

Degree Type

Thesis

Degree Name

Master of Science in Computer Science (MSCS)

Department

Computer Science

Faculty Advisor

Dr. Junggab Son

Chair

Dr. Coskun Cetinkaya

Committee Member

Dr. Kun Suo

Committee Member

Dr. Chih-Cheng Hung

Committee Member

Dr. Junggab Son

Abstract

Network anomalies are correlated to activities that deviate from regular behavior patterns in a network, and they are undetectable until their actions are defined as malicious. Current work in network anomaly detection includes network-based and host-based intrusion detection systems. However, network anomaly detection schemes can suffer from high false detection rates due to the base rate fallacy. When the detection rate is less than the false positive rate, which is found in network anomaly detection schemes working with live data, a high false detection rate can occur. To overcome such a drawback, this paper proposes a superior behavior-based anomaly detection system (SuperB) that defines legitimate network behaviors of authorized users in order to identify unauthorized accesses. I define the network behaviors of the authorized users by training the proposed deep learning model with time series data extracted from network packets of each of the users. Then, the trained model is used to classify all other behaviors (I define these as anomalies) from the defined legitimate behaviors. As a result, SuperB effectively detects all anomalies of network behaviors. The simulation results show that SuperB needs at least five end-to-end network conversations to achieve over 95% accuracy and over 93% true positive rate. Some simulations achieved 100% accuracy and true positive rate. The simulations use live network data combined with the CICIDS2017 data set. The performance has an average of less than 1.1% false positive rate, with some simulations showing 0%. The execution time to process each conversation is 85.20 ± 0.60 milliseconds (ms), and thus it takes about only 426 ms to process five conversations to identify an anomaly.

Comments

This is novel research that has been accepted for publication by ICCCN 2020, an IEEE affiliated professional conference.

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