Publications de Linus Gasser | EPFL Graph Search

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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 ...

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 ...

A proof of existence is given for a stationary model of alloy solidification. The system is composed of heat equation, solute equation and Navier-Stokes equations. In rite latter Carman-Kozeny penalization of porous medium models the mushy zone. The problem is first regularized and a sequence of regularized solutions is built thanks to Leray-Schauder's fixed point Theorem. A solution is then extracted by compactness argument.

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 collective signing to commit Bitcoin transactions irreversibly within seconds. ByzCoin achieves Byzantine consensus while preserving Bitcoin's open membership by dynamically forming hash power-proportionate consensus groups that represent recently-successful bl

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 ...

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 ...

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 ...

We combine collective signing and blockchains to create a secure and easy-to-use, decentralized SSH-key management system.

Linus Gasser

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Scalable Bias-Resistant Distributed Randomness

Keeping Authorities “Honest or Bust” with Decentralized Witness Cosigning

Existence for a Stationary Model of Binary Alloy Solidification

CALYPSO: Private Data Management for Decentralized Ledgers

WEB3

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

Proof-of-Personhood: Redemocratizing Permissionless Cryptocurrencies

Enhancing Bitcoin Security and Performance with Strong Consistency via Collective Signing

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

Methods and systems for secure data exchange

Bitcoin Meets Collective Signing

Disk, file and database encryption

MedChain: Accountable and Auditable Data Sharing in Distributed Medical Scenarios

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

Managing Identities Using Blockchains and CoSi

Software-Defined Radio Implementation of Multiple Antenna Systems using Low-Density Parity-Check