Senior Research Software Engineer
Fujitsu Network Communications
Sunnyvale, CA, 94086
|Email: saha cs . ucr . edu (without the blanks)|
Localization in wireless networks, Security in Localization, Authentication techniques, Ethernet switching, Metro Ethernet, Embedded Systems, Sofware Engineering
2006 Ph.D., Computer Science
University of California, Riverside
(Advisor: Professor Mart Molle)
1999 B.E., Computer Science
Jadavpur University, India
I pursued Ph.D. in Computer Science at University of California, Riverside. I worked on some security and accuracy issues in wireless localization. My dissertation, "Cross Layer Techniques to Secure Peer-to-Peer Protocols for Location, Adjacency, and Identity Verification." can be found here. Prior to that, I pursued Bachelors in Computer Science at Jadavpur University and worked at Hughes Software Systems (now renamed to Aricent).
Subsequently, I worked at Cisco (San Jose) and currently working at Fujitsu Network Communications (Sunnyvale). At these places, my focus is in the area of Metro Ethernet (also known as Carrier Ethernet). I work on how IEEE 802.1 Ethernet bridging technologies and Metro Ethernet Forum (MEF) recommendations can be knitted to cater needs of different types service definitions, e.g. residential, corporate, service providers. In paritcular, the goal is to coalesce existing ethernet switches and bridging technologies like IEEE 802.1D, 802.1Q (including 802.1ad and 802.1ah) with service oriented concepts like Ethernet Virtual Connection (EVC) of different types (E-LINE, E-LAN, E-TREE).
Localization is the technique to determine the location (position) of a mobile object. If the target device, the device which is being localized, is dishonest (the device or the agent carrying it) then it attempts to claim itself in a location different from where it actually is. There are several attacks in that genre. So, localization methods need to employ security mechanisms.
The location is computed by making multiple distance measurements from observers to the the target device. The distance measurements are derived from timing measurements of the sent and the received messages. Now, since the communication medium uses elctromagnetic signals (3 * 10^8 m/s), a small error in timing measurement leads to large error in distance. This leads to accuracy requirements in localization methods.
Our research tries to meet the security goals and accuracy goals together. And that too using general off-the-shelf technologies, e.g. IEEE 802.11 packet based wireless networks. We propose a solution (MergeECHO) to breakdown the localization procedure into two phases. First, a MAC layer assisted online phase making use of the physical layer Rx/Tx clock for fine-grain time measurement. Second, an offline phase at application layer for cryptographic and geometric computations.
Separately, I worked with port-based network authentication (IEEE 802.1X). We proposed a network topology to be used in areas with high LAN-port density to make the port layout easy and flexible. We proposed small ethernet switches (called splitters) to use in conjunction with standard ethernet switches. Each splitter does incrementally authenticates the next one.
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