Hiding Traffic Patterns in VoIP Communication

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Fang, Jialue
Major Professor
Yong Guan
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Electrical and Computer Engineering

The Department of Electrical and Computer Engineering (ECpE) contains two focuses. The focus on Electrical Engineering teaches students in the fields of control systems, electromagnetics and non-destructive evaluation, microelectronics, electric power & energy systems, and the like. The Computer Engineering focus teaches in the fields of software systems, embedded systems, networking, information security, computer architecture, etc.

The Department of Electrical Engineering was formed in 1909 from the division of the Department of Physics and Electrical Engineering. In 1985 its name changed to Department of Electrical Engineering and Computer Engineering. In 1995 it became the Department of Electrical and Computer Engineering.

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  • Department of Electrical Engineering (1909-1985)
  • Department of Electrical Engineering and Computer Engineering (1985-1995)

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Voice over IP(VoIP) is widely used in today's communication, VoIP is a methodology that able to converts analog voice signals into digital data packets and support real-time, two-way transmission of conversations using Internet Protocol. Despite of the fact that VoIP technology have greatly developed since the earliest design, it still suffer from the common problem that affect Internet security: hacker. Currently Timing-based attack is the most famous attack method on VoIP. Timing-based traffic analysis attacks mainly based on packet inter-arrival time. Attackers are able to analyze the packet sending time intervals and export user's talking pattern. Finally, attacker can identify the user by comparing the exported talking pattern with the talking pattern in their databases. Therefore, to protect user's identity, we propose a new application to hide user's talking pattern.

In this thesis, we address issues related to traffic analysis attacks and the corresponding countermeasures in VoIP traffic. We focus on a particular class of traffic analysis attack, timing-based correlation attacks, by which an adversary attempt to analyze packet inter-arrival time of a user and correlate the output traffic with the traffic in their database. Correlation method that is used in this type of attack, namely Dynamic Time Warping(DTW) based Correlation. Based on our threat model and known strategies in existing VoIP communication, we develop methods that can effectively counter the timing-based correlation attacks. The empirical results shows the effectiveness of the proposed scheme in term of countering timing-based correlation attacks.

Our experimental result showed that our application is able to hide user's identity in VoIP communication, with a few modifications in the sending process.

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Fri Jan 01 00:00:00 UTC 2016