Lefteris Kokoris-Kogias

eleftherios.kokoriskogias mymail
Google Scholar | DBLP | Twitter | LinkedIn


I am a graduate researcher at EPFL working on Decentralized Systems, Applied Cryptography and Distributed Computing.

I received my MEng in Electrical and Computer Engineering from the National Technical University of Athens and worked as an undergraduate researcher at the Distributed Knowledge and Media Systems Group.

I am a member of the Initiative for Cryptocurrencies and Contracts (IC3) and an IBM PhD Fellow


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. 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
  2. Channels: Horizontal Scaling and Confidentiality on Permissioned Blockchains
    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
  3. 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
  4. 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
  5. 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
    Part of IOST
  6. 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
    Stay Tuned!
  7. 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
  8. 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
    Part of Zilliqa Blockchain

Technical Reports

  1. CALYPSO: Auditable Sharing of Private Data over Blockchains
    E. Kokoris-Kogias, E. Alp, S. Siby, N. Gailly, L. Gasser, P. Jovanovic, E. Syta, and B. Ford

    Deployed in ByzGen
  2. Managing identities using blockchains and CoSi
    E. Kokoris-Kogias, L. Gasser, I. Khoffi, P. Jovanovic, N. Gailly, and B. Ford

    - Prelimary Version of Skipchains

Awards and Honors