Publications by Linus Gasser | EPFL Graph Search

WEB3

Web3 is the next generation of the internet, often referred to as the decentralized or blockchain web. It aims to address the shortcomings of the current centralized web, such as privacy concerns and lack of control over personal data, by leveraging decent ...

Springer Nature2023

Disk, file and database encryption

Linus Gasser, Imad Aad

Disk, file, and database encryption are technologies that protect data confidentiality when stored. Full disk encryption encrypts all data on a disk except the part containing the code to unlock the rest of the disk, which is usually not encrypted. File-ba ...

Springer Nature2023

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

MedChain: Accountable and Auditable Data Sharing in Distributed Medical Scenarios

Jean-Pierre Hubaux, Linus Gasser, Jean Louis Raisaro, Bryan Alexander Ford, Juan Ramón Troncoso-Pastoriza

The current trend towards personalized medicine creates an urgent need to share data among different hospitals and health institutions, which endangers the privacy of the data subjects if not done with the appropriate precautions. Conversely, the frequency ...

2019

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

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

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

Keeping Authorities “Honest or Bust” with Decentralized Witness Cosigning

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

The secret keys of critical network authorities – such as time, name, certificate, and software update services – represent high-value targets for hackers, criminals, and spy agencies wishing to use these keys secretly to compromise other hosts. To protect ...

IEEE2016

Enhancing Bitcoin Security and Performance with Strong Consistency via Collective Signing

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

While showing great promise, Bitcoin requires users to wait tens of minutes for transactions to commit, and even then, offering only probabilistic guarantees. This paper introduces ByzCoin, a novel Byzantine consensus protocol that leverages scalable colle ...

USENIX Association2016