Dr. Lefteris Kokoris-Kogias

Email:
@ist.ac.at
ekokoris mymail
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About

I am a Research Scientist at Novi working on Decentralized Systems, Applied Cryptography and Distributed Computing. I will be joininig IST Austria as an Assistant Professor in Fall 2021.

I received my Ph.D. in Computer Science from EPFL, and my MEng in Electrical and Computer Engineering from the National Technical University of Athens.

Research

I am interested in increasing the digital trust of online information and processes, especially those that impact the physical world. I am working on building a scalable and robust infrastructure for the future decentralised internet focusing on scalable blockchain systems, bias-resistant decentralised randomness generation, secure software update dispersion and novel applications of threshold cryptography and distributed consensus.

Conference Proceedings

  1. “All You Need is DAG( Alphabetical)”
    I. Keidar, E. Kokoris-Kogias, O. Naor, and A. Spiegelman

    in the ACM Symposium on Principles of Distributed Computing, PODC 2021
  2. “Brief Announcement: Be Prepared When Network Goes Bad: An Asynchronous View-Change Protocol (Alphabetical)”
    R. Gelashvili, E. Kokoris-Kogias, A. Spiegelman, and Z. Xiang

    in the ACM Symposium on Principles of Distributed Computing, PODC 2021
  3. “CALYPSO: Private Data Management for Decentralized Ledgers”
    E. Kokoris-Kogias, E. Alp, L. Gasser, P. Jovanovic, E. Syta, and B. Ford

    in the 47th International Conference on Very Large Data Bases, VLDB 2021
    ★ Used by Swisscom
  4. “Brick: Asynchronous State Channels (Alphabetical)”
    G. Avarikioti, E. Kokoris-Kogias, R. Wattenhofer, and D. Zindros

    in the 25th International Conference on Financial Cryptography and Data Security 2021, FC 2021
  5. “ Sok: Communication across distributed ledgers”
    A. Zamyatin, M. Al-Bassam, D. Zindros, E. Kokoris-Kogias, P. Moreno-Sanchez, A. Kiayias, and W. Knottenbelt

    in the 25th International Conference on Financial Cryptography and Data Security 2021, FC 2021
  6. “Asynchronous Distributed Key Generation for Computationally- Secure Randomness, Consensus, and Threshold Signatures.”
    E. Kokoris-Kogias, D. Malkhi, and A. Spiegelman

    in the 27th ACM Conference on Computer and Communications Security, CCS 2020
  7. “ Rethinking General-Purpose Decentralized Computing”
    E. Alp*, E. Kokoris-Kogias*, G. Fragkouli, and B. Ford

    in the 17th Wokrshop on Hot Topics in Operating Systems, HotOS 2019
  8. “Channels: Horizontal Scaling and Confidentiality on Permissioned Blockchains (Alphabetical) ”
    E. Androulaki, C. Cachin, A. De Caro, and E. Kokoris-Kogias

    in the 23rd European Symposium on Research in Computer Security, ESORICS 2018
    ★ Deployed in Hyperledger Fabric
  9. “Omniledger: A secure, scale-out, decentralized ledger via sharding”
    E. Kokoris-Kogias, P. Jovanovic, L. Gasser, N. Gailly, E. Syta, and B. Ford

    in the 39th IEEE Symposium on Security and Privacy, Oakland' 2018
    ★ Part of Harmony Blockchain
  10. “CHAINIAC: Proactive Software-Update Transparency via Collectively Signed Skipchains and Verified Builds”
    K. Nikitin, E. Kokoris-Kogias, P. Jovanovic, N. Gailly, L. Gasser, J. Cappos, and B. Ford

    in the 26th USENIX Security Symposium, Security' 2017
    ★ EPFL E-Voting uses Skipchains
  11. “Scalable bias-resistant distributed randomness”
    E. Syta, P. Jovanovic, E. Kokoris-Kogias, N. Gailly, L. Gasser, I. Khoffi, M. Fischer, and B. Ford

    in the 38th IEEE Symposium on Security and Privacy, Oakland' 2017
    ★ Basis of Cloudflare's League of Entropy
  12. “Proof-of-Personhood: Redemocratizing Permissionless Cryptocurrencies”
    M. Borge Chavez, E. Kokoris-Kogias, P. Jovanovic, L. Gasser, N. Gailly, and B. Ford

    in the 2017 IEEE European Symposium on Security and Privacy Workshops, EuroS&PW 2017
  13. “Managing identities using blockchains and CoSi”
    E. Kokoris-Kogias, L. Gasser, I. Khoffi, P. Jovanovic, N. Gailly, and B. Ford

    in the 9th Workshop on Hot Topics in Privacy Enhancing Technologies, HotPETs 2016
    - Prelimary Version of Skipchains
  14. “TRM-SIoT: A scalable hybrid trust & reputation model for the social internet of things”
    E. Kokoris-Kogias, O. Voutyras, and T. Varvarigou

    in the 21st IEEE Conference on Emerging Technologies and Factory Automation, ETFA 2016
  15. “Enhancing bitcoin security and performance with strong consistency via collective signing”
    E. Kokoris-Kogias, P. Jovanovic, N. Gailly, I. Khoffi, L. Gasser, and B. Ford

    in the 25th USENIX Security Symposium, Security' 2016
    ★ The Backbone of Cypherium

Technical Reports

  1. “ Divide and Scale: Formalization of Distributed Ledger Sharding Protocols (Alphabetical) ”
    G. Avarikioti, E. Kokoris-Kogias, and R. Wattenhofer

Awards and Honors

created by Lefteris Kokoris-Kogias.