Petros Efstathopoulos

Dr. Petros Efstathopoulos is currently the Global Head of Global Head of NortonLifeLock Research Group (NRG).

He holds Ph.D. And M.Sc. degrees in Computer Science from the University of California, Los Angeles (UCLA) and a B.Sc. degree in Electrical and Computer Engineering from the National Technical University of Athens, Greece (NTUA). During his Ph.D. he worked on the Asbestos operating system, which introduced decentralized information flow control to contain the effects of bugs and provide improved security.

Dr. Efstathopoulos has worked on the design and implementation of a variety of computer systems, including operating systems and kernel development, storage and file systems, security, distributed systems, virtualization, and systems networking. Since joining the company in 2009, he has focused particularly on next-generation storage/backup systems, portable storage security, network security, privacy and identity. He has authored multiple research papers and numerous patents.

Selected Academic Papers

  • Utility-Driven Graph Summarization
    K. Ashwin Kumar, Petros Efstathopoulos
    In Proceedings of the 45th International Conference on Very Large Database (VLDB 2019)

    In this work, we present a novel approach to summarize a complex graph driven by the objective of maximizing the utility of the calculated graph summary. Subsequently, we propose a utility-driven summarization algorithm, that allows a user to query a graph summary with a specified utility value.

  • Lean On Me: Mining Internet Service Dependencies From Large-Scale DNS Data
    Matteo Dell'Amico, Leyla Bilge, Ashwin Kayyoor, Petros Efstathopoulos, Pierre-Antoine Vervier
    In Proceedings of the 33th Annual computer Security Applications Conference (ACSAC 2017)

    To assess the security risk for a given entity, and motivated by the effects of recent service disruptions, we perform a large-scale analysis of passive and active DNS datasets including more than 2.5 trillion queries in order to discover the dependencies between websites and Internet services.

  • Efficient Routing for Cost Effective Scale-out Data Architectures
    Ashwin Narayan, Vuk Markovic, Natalia Postawa, Anna King, Alejandro Morales, K. Ashwin Kumar, Petros Efstathopoulos
    In Proceedings of the IEEE International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS'16)

    In the context of large-scale data architectures, we propose an efficient technique to speedup the routing of a large number of real-time queries while minimizing the number of machines that each query touches (query span).

  • Harbormaster: Policy Enforcement for Containers
    Mingwei Zhang, Daniel Marino, Petros Efstathopoulos
    In Proceedings of the 7th IEEE International Conference on Cloud Computing Technology and Science (CloudCom'15)

    We present Harbormaster, a system that improves the security of running Docker containers on shared infrastructure. Harbormaster enforces policies on container management operations, allowing administrators to implement the principle of least privilege.

  • TrackAdvisor: Taking back browsing privacy from Third-Party Trackers
    Tai-Ching Li, Huy Hang, Michalis Faloutsos, and Petros Efstathopoulos
    In Proceedings of the Passive and Active Measurement Conference (PAM), New York, 2015.

    A study aiming to measure accurately how widespread third-party tracking is online, and  hopefully raise the public awareness to its potential privacy risks.