Refereed Journal Publications:
  1. Firewall Policy Queries [PDF] [BibTex]
    Alex X. Liu and Mohamed G. Gouda
    IEEE Transactions on Parallel and Distributed Systems (TPDS), in press.
  2. Complete Redundancy Removal for Packet Classifiers in TCAMs [BibTex]
    Alex X. Liu and Mohamed G. Gouda
    IEEE Transactions on Parallel and Distributed Systems (TPDS), in press.
  3. PAP: A Privacy and Authentication Protocol for Passive RFID Tags
    Alex X. Liu and LeRoy Bailey
    Journal of Computer Communications (COMCOM, Elsevier), in press.
  4. Diverse Firewall Design [PDF][BibTex]
    Alex X. Liu and Mohamed G. Gouda
    IEEE Transactions on Parallel and Distributed Systems (TPDS), Vol. 19, No. 8. August 2008 (Conference version appeared in DSN-2004 and won William C. Carter Award)
  5. SPP: An Anti-phishing Single Password Protocol [PDF][BibTex]
    Mohamed G. Gouda, Alex X. Liu, Lok M. Leung, and Mohamed A. Alam
    Journal of Computer Networks (COMNET, Elsevier), Vol. 51, No. 13, pages 1389-1286, September, 2007
  6. Structured Firewall Design [PDF][BibTex]
    Mohamed G. Gouda and Alex X. Liu
    Journal of Computer Networks (COMNET, Elsevier), Vol. 51, No. 4, pages 1106-1120, March 2007
  7. Key Bundles and Parcels: Secure Communication in Many Groups[PDF][BibTex]
    Eunjin Jung, Alex X. Liu, and Mohamed G. Gouda
    Journal of Computer Networks (COMNET, Elsevier), Vol. 50, No. 11, pages 1781-1798, August 2006
  8. RFIDGuard: A Lightweight Privacy and Authentication Protocol for Passive RFID Tags [BibTex]
    Alex X. Liu, LeRoy A. Bailey, and Adithya H. Krishnamurthy
    Journal of Security and Communication Networks, in press.
  9. Formal Specification and Verification of a Secure Micropayment Protocol [PDF][BibTex]
    Mohamed G. Gouda and Alex X. Liu
    International Journal of Network Security, Vol. 7, No. 1, pages 82-88, 2008.
Refereed Conference Publications:

Firewalls and Packet Processing Systems

  1. Topological Transformation Approaches to Optimizing TCAM-Based Packet Processing Systems [PDF]
    Chad R. Meiners, Alex X. Liu, and Eric Torng
    in Proceedings of the International Conference on Measurement and Modeling of Computer Systems (SIGMETRICS) , Seattle, Washington, June 2009.
    Acceptance rate: 27/180 = 15%.
  2. Collaborative Enforcement of Firewall Policies in Virtual Private Networks [PDF][BibTex]
    Alex X. Liu, Fei Chen
    in Proceedings of the Annual ACM SIGACT-SIGOPS Symposium on Principles of Distributed Computing (PODC) , Toronto, Canada, August 2008.
    Average review score = (4 + 4 + 4)/3 = 4 out of 5.
    Acceptance rate: 40/132 = 30%
  3. XEngine: A Fast and Scalable XACML Policy Evaluation Engine [PDF][BibTex]
    Alex X. Liu, Fei Chen, JeeHyun Hwang, and Tao Xie
    in Proceedings of the International Conference on Measurement and Modeling of Computer Systems (SIGMETRICS) , Annapolis, Maryland, June 2008.
    Acceptance rate: 36/201 = 18%. Average review score = 8.7 out of 10. Ranked 2nd among all submissions.
    Sample quotes from diligent reviewers
    Full version is available here: [PDF]
  4. Algorithmic Approaches to Redesigning TCAM-Based Systems [PDF]
    Chad R. Meiners, Alex X. Liu, Eric Torng
    in Proceedings of the International Conference on Measurement and Modeling of Computer Systems (SIGMETRICS) , Annapolis, Maryland, June 2008. (extended abstract)
  5. Topological Transformation Approaches to Optimizing TCAM-Based Packet Processing Systems [PDF]
    Chad R. Meiners, Alex X. Liu, and Eric Torng
    in Proceedings of ACM SIGCOMM , Annapolis, Maryland, June 2008. (poster paper)
  6. All-Match Based Complete Redundancy Removal for Packet Classifiers in TCAMs [PDF][BibTex]
    Alex X. Liu, Chad R. Meiners, and Yun Zhou
    in Proceedings of the 27th Annual IEEE Conference on Computer Communications (INFOCOM), Phoenix, Arizona, April 2008.
    Average review score = (4 + 4 + 4)/3 = 4.
    Acceptance rate: 236/1160 =20.3%
  7. Firewall Compressor: An Algorithm for Minimizing Firewall Policies [PDF][BibTex]
    Alex X. Liu, Eric Torng, and Chad Meiners
    in Proceedings of the 27th Annual IEEE Conference on Computer Communications (INFOCOM), Phoenix, Arizona, April 2008.
    Acceptance rate: 236/1160 =20.3%
  8. Systematic Structural Testing of Firewall Policies [PDF][BibTex]
    Jeehyun Hwang, Tao Xie, Fei Chen, and Alex X. Liu
    in Proceedings of the 27th IEEE International Symposium on Reliable Distributed Systems (SRDS), Napoli, Italy, October, 2008.
    Acceptance rate: 28/112 =25%
  9. Verification of Distributed Firewalls [PDF][BibTex]
    Mohamed Gouda, Alex X. Liu, and Mansoor Jafry
    in Proceedings of the IEEE Global Communications Conference (GLOBECOM), New Oreleans, LA, November, 2008.
    Acceptance rate: 27%
  10. Formal Verification of Firewall Policies [PDF][BibTex]
    Alex X. Liu
    in Proceedings of the 2008 IEEE International Conference on Communications (ICC) , Beijing, China, May 2008.
  11. TCAM Razor: A Systematic Approach Towards Minimizing Packet Classifiers in TCAMs [PDF][BibTex]
    Chad R. Meiners, Alex X. Liu, and Eric Torng
    in Proceedings of the 15th IEEE International Conference on Network Protocols (ICNP), pages 226-275, Beijing, China, October 2007.
    Acceptance rate: 32/220=14.5%
  12. Change-Impact Analysis of Firewall Policies [PDF][BibTex]
    Alex X. Liu
    in Proceedings of the 12th European Symposium Research Computer Security (ESORICS), pages 155-170, Dresden, Germany, September 2007.
    Acceptance rate: 39/164=23.7%
  13. A Model of Stateful Firewalls and its Properties [PDF][BibTex]
    Mohamed G. Gouda and Alex X. Liu
    in Proceedings of the IEEE International Conference on Dependable Systems and Networks (DSN), Yokohama, Japan, June 2005.
    Acceptance Rate: 78/319=24.5%
  14. Diverse Firewall Design [PDF][BibTex]
    Alex X. Liu and Mohamed G. Gouda
    in Proceedings of the IEEE International Conference on Dependable Systems and Networks (DSN), pages 595-604, Florence, Italy, June 2004.
    Acceptance Rate: 83/377=22.0%
    William C. Carter Award
  15. Firewall Design: Consistency, Completeness and Compactness [PDF][BibTex]
    Mohamed G. Gouda and Alex X. Liu
    in Proceedings ofthe 24th IEEE International Conference on Distributed Computing Systems (ICDCS), pages 320-327, Tokyo, Japan, March 2004.
    Acceptance Rate: 72/406=17.7%
  16. Firewall Queries[PDF][BibTex]
    Alex X. Liu, Mohamed G. Gouda, Huibo Heidi Ma and Anne HH. Ngu
    in Proceedings of the 8th International Conference on Principles of Distributed Systems (OPODIS),
    LNCS 3544, pages 197-212, T. Higashino Ed., Springer-Verlag, Grenoble, France, December 2004.
    Acceptance Rate: 30/102=29.4%
  17. Complete Redundancy Detection in Firewalls [PDF][BibTex]
    Alex X. Liu and Mohamed G. Gouda
    in Proceedings of 19th Annual IFIP Conference on Data and Applications Security (DBSec)
    LNCS 3654, pages 196-209, S. Jajodia and D. Wijesekera Ed., Springer-Verlag, Storrs, Connecticut, August 2005.
    Acceptance Rate: 44%
  18. Non-Intrusive Testing of Firewalls[BibTex]
    Alex X. Liu, Mohamed G. Gouda, Huibo Heidi Ma and Anne HH. Ngu
    Invited paper, in Proceedings of the 1st International Computer Engineering Conference (ICENCO), Cairo, Egypt, December 2004.
  19. Removing Redundancy from Packet Classifiers
    Alex X. Liu and Mohamed G. Gouda
    in Proceedings of SIGCOMM (poster), Portland, Oregon, August 2004.

Traffic Classification

  1. Iustitia: An Information Theoretical Approach to High-speed Flow Nature Identification [PDF]
    Amir R. Khakpour and Alex X. Liu
    in Proceedings of the 29th International Conference on Distributed Computing Systems (ICDCS) , Montreal, Quebec, Canada, June 2009.
    Acceptance rate: 74/455 = 16%.

BGP Security

  1. Symmetric Key Approaches to Securing BGP -- A Little Bit Trust is Enough [PDF][BibTex]
    Bezawada Bruhadeshwar, Sandeep S. Kulkarni, and Alex X. Liu
    in Proceedings of the 12th European Symposium Research Computer Security (ESORICS), Malaga, Spain, October, 2008.
    Acceptance rate: 37/168 =22%

Sensor Networks Security

  1. Securing Sensor Nodes Against Side Channel Attacks [PDF][BibTex]
    Kanthakumar Pongaliur, Zubin Abraham, Alex X. Liu, Li Xiao, Leo Kempel
    in Proceedings of the 27th IEEE High Assurance Systems Engineering Symposium (HASE), Nanjing, China, December, 2008.
    Acceptance rate: 44/196 =22.4%

RFID Security and Privacy

  1. RFID Authentication and Privacy Protocols [BibTex]
    LeRoy Bailey and Alex X. Liu
    Book chapter in ``RFID and Sensor Networks: Architectures, Protocols, Security and Integrations'', Auerbach Publications, Taylor & Francis Group, USA, 2008
  2. PAP: A Privacy and Authentication Protocol for Passive RFID Tags [PDF][BibTex]
    Alex X. Liu and LeRoy Bailey
    in Proceedings of the IEEE International Conference on Computer Communications and Networks (ICCCN), St. Thomas, U.S. Virgin Islands, August, 2008
    Acceptance rate: 104/399=26%

Authentication

  1. Single Password, Multiple Accounts [PDF][BibTex]
    Mohamed G. Gouda, Alex X. Liu, Lok M. Leung, and Mohamed A. Alam
    in Proceedings of 3rd Applied Cryptography and Network Security Conference (industry track) (ACNS), New York City, New York, June 2005.
    Acceptance Rate: 22.2%
  2. A Secure Cookie Protocol [PDF][BibTex]
    Alex X. Liu, Jason M. Kovacs, Chin-Tser Huang, and Mohamed G. Gouda.
    in Proceedings of the 14th IEEE International Conference on Computer Communications and Networks (ICCCN), San Diego, California, October 2005.
    Acceptance Rate: 87/260=33.4%

Key Management

  1. Key Bundles and Parcels: Secure Communication in Many Groups [PDF][BibTex]
    Eunjin Jung, Alex X. Liu and Mohamed G. Gouda
    in Proceedings of the 5th International Workshop on Networked Group Communications (NGC),, LNCS 2816, pages 119-130, B. Stiller Ed., Springer-Verlag, Munich, Germany, September 2003.
    Acceptance Rate: 25/78=32.0%

Security Verification

  1. Formal Specification and Verification of a Micropayment Protocol [PDF][BibTex]
    Mohamed G. Gouda and Alex X. Liu
    in Proceedings of the 13th IEEE International Conference on Computer Communications and Networks (ICCCN), Chicago, Illinois, October 2004.
    Acceptance Rate: 81/200=40.5%

Anti-Spam

  1. Zmail: Zero-Sum Free Market Control of Spam [PDF][BibTex]
    Benjamin J. Kuipers, Alex X. Liu, Aashin Gautam, and Mohamed G. Gouda
    in Proceedings of the 4th International Workshop on Assurance in Distributed Systems and Networks (ADSN), Columbus, Ohio, June 2005.

Worms

  1. On Capturing and Containing E-mail Worms [PDF][BibTex]
    Chin-Tser Huang, Nathan L. Johnson, Jeff Janies, and Alex X. Liu
    in Proceedings of the 25th IEEE International Performance Computing and Communications Conference (IPCCC), Phoenix, Arizona, April 2006.
    Acceptance Rate: 40%

Technical Reports