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research interests |
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His research mainly focuses on the following areas:
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Wireless network security
- 802.11i -- wireless local area network (WLAN) security
- Mobile network -- 4G (LTE-Advanced) and 5G (D2D and MTC)
- Distributed mobility management (DMM)
- Internet of Things (IoT) -- M2M
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System hacking
- Reverse engineering
- Vulnerability exploitation on operating systems
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Miscellaneous
- Secure deletion
- Anonymous and secure routing -- TOR and BGP
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OS security in smart phones |
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The growing popularity of smart phones makes it important that we have accurate understanding of security in their various OSes. We expect that Anroid and iPhone OS (IOS) will be dominant in a market. Hence, their
vulnerabilities are a direct consequence of our security. Among many security issues, we mainly concentrate on privacy issues at this moment.
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Internet traffic monitoring |
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Heterogeneous traffic is flowing in the Internet. A number of
applications and systems are developed without exact understanding of
traffic characteristics. As a result engineers experience a distance
between the final product and the early design. We attempt to develop a
model for such applications as WWW, P2P and game. This model should help
engineers to understand the Internet more accurate.
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wireless network security |
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Wireless networks becomes a part of our life and their security has many meanings. The most popular form comes in WLAN and its security problems have been known critical. In an
effort to improve this security problem 802.11i has been proposed. We see new two networks, VANET and healthcare networks, will draw great attention to our community. We are trying to define security problems in these networks before these networks are deployed.
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3G and 4G networks |
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The main goal in the 3G and 4G networks is to allow user to access
service anywhere and anytime. In doing so interconnections between
service providers and between different protocols are essential. One
issue in the interconnection is to validate user's legitimacy. 3GPP and
3GPP2 propose different standards for the authentication. We try to
suggest a solution in the 3G and 4G networks for the aim of seamless
interconnection.
In addition, mobile IP (version 4 and version 6) supports the 3G and 4G
networks for the network protocol and the handover protocol. Not only
that VPN is an essential tool for a roaming user to access to his home
network. Here, the authentication is a big issue to guarantee the high
qualify of service. Our research aims to provide such an authentication
protocol suitable for 3G and 4G networks.
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network security |
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An early detection of the abnormal traffic is a difficult problem. Since
the abnormal traffic is by nature not known in priori high accuracy in
the detection is hard to attain. The detection time is the trade-off
with the complexity of the algorithm. We develop an algorithm for the
abnormal traffic detection; that is easy to implement, accurate enough
to detect unknown attacks and early to identify the nature of the
attack. |
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