I recently completed my PhD in Computer Science from Columbia University, New York, where I worked in the Network Security Lab (NSL) and was advised by Prof. Angelos D. Keromytis. I have been working as an Assistant Professor at the Computer Science and Engineering Department of Indraprastha Institute of Information Technology (IIIT Delhi) since June 2014.


Research Interests: Large scale Internet surveillance and resistance to such activities, network anonymity and privacy and network and distributed systems security in general.

Thesis titleTraffic Analysis Attacks and Defenses in Low Latency Anonymous Communication Systems. Doctoral Thesis (available on request).



                                                                                                                        Contact information:

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                                                                                                                    Office hours: By appointment


Education

Columbia University, New York, NY
PhD (Computer Science), 2014

Columbia University, New York, NY
MS (Computer Engineering), 2007

Delhi University, India
BIS (Computer Science), 2004

Teaching
    1.  Security Engineering - Winter 2015
          Timings and Location:  Tue. 11:00 AM -- 12:30 PM (C11)
                                            Fri.  11:00 AM -- 12:30 PM (C11)
    2.  Network Anonymity and Privacy - Monsoon 2015.
         Timings and Location:  Tue. 4:00 PM -- 5:30 PM (C13)
                                           Fri.  4:00 PM -- 5:30 PM (C13)
    3. Security Engineering - Winter 2016
         Timings and location:   Tue. 11:30 AM -- 1:00 PM (C12)
                                           Fri. 11:30 AM -- 1:00 PM (C12)
    4. Network Security - Monsoon 2016
          Timings and location: Mon 2:30 PM -- 4:00 PM (C01)
                                           Wed 2:30 PM -- 4:00 PM (C01)
    5. Security Enginering - Winter 2017
          
Timings and location:   Tue. 11:30 AM -- 1:00 PM (C12)
                                             Fri. 11:30 AM -- 1:00 PM (C12)
       


Publications
 
  1. S. Chakravarty, V. Naik, H. B. Acharya and C. S. Tanwar. Towards Practical Decoy Routing Infrastructure (Positional Paper). To appear in the Proceedings of 2nd Workshop on Security in Emerging Networking Technologies (SENT), (co-located with NDSS 2015), San Diego, California, February 2015.
  2. S. Chakravarty, G. Portokalidis, M. Polychronakis and A. D. Keromytis. Detection and Analysis of Eavesdropping in Anonymous Communication Networks. To appear in the International Journal of Information Security (IJIS).
  3. S. Chakravarty, M. V. Barbera, G. Portokalidis, M. Polychronakis and A. D. Keromytis. On the Effectiveness of Traffic Analysis Against Anonymity Networks Using Flow Records. To appear in the Proceedings of the 15th Passive and Active Measurement Conference (PAM), Los Angeles, CA, March 2014. 
  4. S. Chakravarty, G. Portokalidis, M. Polychronakis and A. D. Keromytis. Detecting Traffic Snooping in Tor Using Decoys. International Symposium on Recent Advances in Intrusion Detection (RAID) pp. 222 - 241, Menlo Park, CA, September 2011.
  5. S. Chakravarty, A. Stavrou and A. D. Keromytis. Traffic Analysis Against Low-Latency Anonymity Networks Using Available Bandwidth Estimation. In Proceedings of 15th European Symposium of Research in Computer Security (ESORICS), pp. 249 - 267, Athens, Greece, September 2010.
  6. S. Chakravarty, A. Stavrou, and A. D. Keromytis. Identifying Proxy Nodes in a Tor Anonymization Circuit. In Proceedigs of 2nd Workshop on Security and Privacy in Telecommunications and Information Systems (SePTIS), pp. 633 - 639. Bali, Indonesia, December 2008.
  7. A. Dutta, S. Chakravarty, K. Taniuchi, V. Fajardo, Y. Ohba, D. Famolari, H. Schulzrinne An Experimental Study of Location Assisted Proactive Handover. In Proceedings of 50th IEEE Global Communications Conference (GLOBECOMM), Washington DC, USA , December 2007.
Technical Reports
  1. S. Chakravarty, M. V. Barbera, G. Portokalidis, M. Polychronakis and A. D. Keromytis. On the Effectiveness of Traffic Analysis Against Anonymity Networks Using Flow Records.Technical Report cucs-019-13, Columbia University, New York, NY, USA, July 2013.
  2. S.Chakravarty, G. Portokalidis, M. Polychronakis, and A. D. Keromytis. Detecting Traffic Snooping in Anonymity Networks Using Decoys. Technical Report cucs-005-11, Columbia University , New York , NY , USA, February 2011. 
  3. S.Chakravarty, A.Stavrou, and A. D. Keromytis. Approximating a Global Passive Adversary Against Tor. Technical Report cucs-038-08, Columbia University , New York , NY , USA, August 2008.
  4. S.Chakravarty, A.Stavrou, and A. D. Keromytis. LinkWidth: A Method to Measure Link Capacity and Available Bandwidth using Single-End Probes. Technical Report cucs-002-08, Columbia University , New York , NY , USA, January 2008.