Publications by Eleftherios Kokoris Kogias

CALYPSO: Private Data Management for Decentralized Ledgers

Linus Gasser, Eleftherios Kokoris Kogias, Bryan Alexander Ford, Philipp Svetolik Jovanovic, Enis Ceyhun Alp

Distributed ledgers provide high availability and integrity, making them a key enabler for practical and secure computation of distributed workloads among mutually distrustful parties. Many practical applications also require strong confidentiality, howeve ...

2021

Methods and systems for secure data exchange

Linus Gasser, Eleftherios Kokoris Kogias, Bryan Alexander Ford

The present invention concerns a computer-implemented method for secure data exchange between a sender (A) and a recipient (B), wherein the method is performed by the sender (A) and comprises encrypting data using a symmetric key k, creating a write transa ...

2019

Rethinking General-Purpose Decentralized Computing

Eleftherios Kokoris Kogias, Bryan Alexander Ford, Georgia Fragkouli, Enis Ceyhun Alp

While showing great promise, smart contracts are difficult to program correctly, as they need a deep understanding of cryptography and distributed algorithms, and offer limited functionality, as they have to be deterministic and cannot operate on secret da ...

Association for Computing Machinery2019

Secure, Confidential Blockchains Providing High Throughput and Low Latency

Eleftherios Kokoris Kogias

One of the core promises of blockchain technology is that of enabling trustworthy data dissemination in a trustless environment. What current blockchain systems deliver, however, is slow dissemination of public data, rendering blockchain technology unusabl ...

EPFL2019

Cryptographically verifiable data structure having multi-hop forward and backwards links and associated systems and methods

Linus Gasser, Eleftherios Kokoris Kogias, Bryan Alexander Ford, Philipp Svetolik Jovanovic

Data storage and retrieval systems, methods, and computer-readable media utilize a cryptographically verifiable data structure that facilitates verification of a transaction in a decentralized peer-to-peer environment using multi-hop backwards and forwards ...

2018

Channels: Horizontal Scaling and Confidentiality on Permissioned Blockchains

Christian Cachin, Eleftherios Kokoris Kogias

Sharding, or partitioning the system's state so that different subsets of participants handle it, is a proven approach to building distributed systems whose total capacity scales horizontally with the number of participants. Many distributed ledgers have a ...

SPRINGER INTERNATIONAL PUBLISHING AG2018

OmniLedger: A Secure, Scale-Out, Decentralized Ledger via Sharding

Linus Gasser, Nicolas Gailly, Eleftherios Kokoris Kogias, Bryan Alexander Ford, Philipp Svetolik Jovanovic

Designing a secure permissionless distributed ledger (blockchain) that performs on par with centralized payment processors, such as Visa, is a challenging task. Most existing distributed ledgers are unable to scale-out, i.e., to grow their total processing ...

IEEE2018

CHAINIAC: Proactive Software-Update Transparency via Collectively Signed Skipchains and Verified Builds

Linus Gasser, Nicolas Gailly, Kirill Nikitin, Eleftherios Kokoris Kogias, Bryan Alexander Ford, Ismail Khoffi, Philipp Svetolik Jovanovic

Software-update mechanisms are critical to the security of modern systems, but their typically centralized design presents a lucrative and frequently attacked target. In this work, we propose CHAINIAC, a decentralized software-update framework that elimina ...

USENIX Association2017

Proof-of-Personhood: Redemocratizing Permissionless Cryptocurrencies

Linus Gasser, Nicolas Gailly, Eleftherios Kokoris Kogias, Bryan Alexander Ford, Maria Fernanda Borge Chavez, Philipp Svetolik Jovanovic

Permissionless blockchain-based cryptocurrencies commonly use proof-of-work (PoW) or proof-of-stake (PoS) to ensure their security, e.g. to prevent double spending attacks. However, both approaches have disadvantages: PoW leads to massive amounts of wasted ...

IEEE2017

Scalable Bias-Resistant Distributed Randomness

Linus Gasser, Nicolas Gailly, Eleftherios Kokoris Kogias, Bryan Alexander Ford, Ismail Khoffi, Philipp Svetolik Jovanovic

Bias-resistant public randomness is a critical component in many (distributed) protocols. Existing solutions do not scale to hundreds or thousands of participants, as is needed in many decentralized systems. We propose two large-scale distributed protocols ...

IEEE2017