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Bryan Alexander Ford

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Publications associées (43)

Reducing Metadata Leakage from Encrypted Files and Communication with PURBs

Jean-Pierre Hubaux, Ludovic Barman, Kirill Nikitin, Matthew Joshua Underwood, Bryan Alexander Ford, Wouter Lueks

Most encrypted data formats leak metadata via their plaintext headers, such as format version, encryption schemes used, number of recipients who can decrypt the data, and even the recipients’ identities. This leakage can pose security and privacy risks to ...

Sciendo2019

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

On Enforcing the Digital Immunity of a Large Humanitarian Organization

Jean-Pierre Hubaux, Bryan Alexander Ford, Philipp Svetolik Jovanovic, Juan Ramón Troncoso-Pastoriza

Humanitarian action, the process of aiding individuals in situations of crises, poses unique information-security challenges due to natural or manmade disasters, the adverse environments in which it takes place, and the scale and multidisciplinary nature o ...

2018

System and method for providing a collective decentralized authority for sharing sensitive data

Jean-Pierre Hubaux, Patricia Egger, Zhicong Huang, Jean Louis Raisaro, Bryan Alexander Ford

A method of sharing private and/or sensitive data from plurality of data providers to a data user, the data user having a private key and a public key, the method comprising the steps of providing a first data set and encrypting the first data set at a ter ...

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

Systems and method for anonymous, low-latencey, tracking-resistant communications in a networked environment

Jean-Pierre Hubaux, Ludovic Barman, Italo Ivan Dacosta Petrocelli, Bryan Alexander Ford

Exemplary embodiments of the present disclosure provide cryptographically-strong tracking protection with unnoticeable "single-hop" network latencies by leveraging a client-relay- server architecture, in which the clients, relays (trusted or untrusted), an ...

2018

MedCo: Enabling Privacy-Conscious Exploration of Distributed Clinical and Genomic Data

Jean-Pierre Hubaux, Olivier Michielin, Mickaël Misbach, Jean Louis Raisaro, Bryan Alexander Ford, Joao André Gomes de Sá e Sousa, Juan Ramón Troncoso-Pastoriza

Being able to share large amounts of sensitive clinical and genomic data across several institutions is crucial for precision medicine to scale up. Unfor- tunately, existing solutions only partially address this challenge and are still unable to provide th ...

2017

UnLynx: A Decentralized System for Privacy-Conscious Data Sharing

Jean-Pierre Hubaux, Patricia Egger, David Jules Froelicher, Christian Vincent Mouchet, Zhicong Huang, Jean Louis Raisaro, Bryan Alexander Ford, Joao André Gomes de Sá e Sousa

Current solutions for privacy-preserving data sharing among multiple parties either depend on a centralized authority that must be trusted and provides only weakest-link security (e.g., the entity that manages private/secret cryptographic keys), or leverag ...

De Gruyter2017

Atom: Horizontally Scaling Strong Anonymity

Bryan Alexander Ford, Henry Nathaniel Corrigan-Gibbs

Atom is an anonymous messaging system that protects against traffic-analysis attacks. Unlike many prior systems, each Atom server touches only a small fraction of the total messages routed through the network. As a result, the system’s capacity scales near ...

Association for Computing Machinery2017

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

Multiple Objectives of Lawful-Surveillance Protocols

Bryan Alexander Ford

In recent work on open, privacy-preserving, accountable surveillance, we have proposed the use of cryptographic protocols that enable law-enforcement and intelligence agencies to obtain actionable information about targeted users of mass-communication syst ...

2017

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

PriFi: A Low-Latency and Tracking-Resistant Protocol for Local-Area Anonymous Communication

Jean-Pierre Hubaux, Ludovic Barman, Italo Ivan Dacosta Petrocelli, Bryan Alexander Ford, Mahdi Zamani

Popular anonymity mechanisms such as Tor provide low communication latency but are vulnerable to traffic analysis attacks that can de-anonymize users. Moreover, known traffic-analysis-resistant techniques such as Dissent are impractical for use in latency- ...

ACM2016

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

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

Building Privacy-Preserving Cryptographic Credentials from Federated Online Identities

Ennan Zhai, Bryan Alexander Ford

Federated identity providers, e.g., Facebook and PayPal, offer a convenient means for authenticating users to third-party applications. Unfortunately such cross-site authentications carry privacy and tracking risks. For example, federated identity provider ...

Association for Computing Machinery2016

Metadata Protection Considerations for TLS Present and Future

Bryan Alexander Ford

TLS 1.3 takes important steps to improve both performance and security, so far offers little protection against traffic analysis or fingerprinting using unencrypted metadata or other side-channels such as transmission lengths and timings. This paper explor ...

2016

Seeking Anonymity in an Internet Panopticon

Bryan Alexander Ford

Internet, users often need to assume, by default, that their every statement or action online is monitored and tracked. The Dissent project at Yale University takes a collective approach to online anonymity, based on different algorithmic foundations from ...

2015

Private Eyes: Secure Remote Biometric Authentication

Bryan Alexander Ford

We propose an efficient remote biometric authentication protocol that gives strong protection to the user’s biometric data in case of two common kinds of security breaches: (1) loss or theft of the user’s token (smart card, handheld device, etc.), giving t ...

SciTePress2015

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