Publications de Ludovic Barman

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Most communication systems (e.g., e-mails, instant messengers, VPNs) use encryption to prevent third parties from learning sensitive information. However, encrypted communications protect the contents but often leak metadata: the amount of data sent and th ...

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 ...

Recently, several solutions have been proposed to address the complex challenge of protecting individuals’ genetic data during personalized medicine tests. In this short paper, we analyze different privacy threats and propose simple countermeasures for the ...

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- ...

Metadata-private messaging designs that scale to support millions of users are rigid: they limit users to a single device that is online all the time and transmits on short regular intervals, and require users to choose precisely when each of their buddies ...

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 ...

Organizational networks are vulnerable to traffic-analysis attacks that enable adversaries to infer sensitive information from the network traffic – even if encryption is used. Typical anonymous communication networks are tailored to the Internet and are p ...

Ludovic Barman

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Analyzing and Protecting Communication Metadata

Reducing Metadata Leakage from Encrypted Files and Communication with PURBs

Privacy Threats and Practical Solutions for Genetic Risk Tests

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

Groove: Flexible Metadata-Private Messaging

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

PriFi: Low-Latency Anonymity for Organizational Networks

Every Byte Matters: Traffic Analysis of Bluetooth Wearable Devices