Publications by Julien Freudiger

Non-Cooperative Location Privacy

Jean-Pierre Hubaux, Julien Freudiger, David C. Parkes

In mobile networks, authentication is a required primitive for most security protocols. Unfortunately, an adversary can monitor pseudonyms used for authentication to track the location of mobile nodes. A frequently proposed solution to protect location pri ...

Ieee Computer Soc2013

Privacy of Community Pseudonyms in Wireless Peer-to-Peer Networks

Jean-Pierre Hubaux, Julien Freudiger, Murtuza Jadliwala, Valtteri Niemi

Wireless networks offer novel means to enhance social interactions. In particular, peer-to-peer wireless communications enable direct and real-time interaction with nearby devices and communities and could extend current online social networks by providing ...

Springer2013

When Whereabouts is No Longer Thereabouts : Location Privacy in Wireless Networks

Julien Freudiger

Modern mobile devices are fast, programmable and feature localization and wireless capabilities. These technological advances notably facilitate mobile access to Internet, development of mobile applications and sharing of personal information, such as loca ...

EPFL2011

Privacy-Triggered Communications in Pervasive Social Networks

Jean-Pierre Hubaux, Julien Freudiger, Imad Aad, Murtuza Jadliwala, Valtteri Niemi

2011

The Inconvenient Truth about Web Certificates

Jean-Pierre Hubaux, Julien Freudiger, Nevena Vratonjic, Vincent Bindschaedler

HTTPS is the de facto standard for securing Internet communications. Although it is widely deployed, the security provided with HTTPS in practice is dubious. HTTPS may fail to provide security for multiple reasons, mostly due to certificate-based authentic ...

2011

Evaluating the Privacy Risk of Location-Based Services

Jean-Pierre Hubaux, Julien Freudiger, Reza Shokri

In modern mobile networks, users increasingly share their location with third-parties in return for location-based services. In this way, users obtain services customized to their location. Yet, such communications leak location information about users. Ev ...

Springer-Verlag Berlin2011

SensorTune: a Mobile Auditory Interface for DIY Wireless Sensor Networks

Jean-Pierre Hubaux, Jacques Panchard, Guillaume Zufferey, Julien Freudiger, Jeffrey Huang, Enrico Costanza

Wireless Sensor Networks (WSNs) allow the monitoring of activity or environmental conditions over a large area, from homes to industrial plants, from agriculture fields to forests and glaciers. They can support a variety of applications, from assisted livi ...

2010

Unraveling an Old Cloak: k-anonymity for Location Privacy

Jean-Pierre Hubaux, Julien Freudiger, Reza Shokri, Carmela González Troncoso

There is a rich collection of literature that aims at protecting the privacy of users querying location-based services. One of the most popular location privacy techniques consists in cloaking users' locations such that k users appear as potential senders ...

ACM2010

On the Age of Pseudonyms in Mobile Ad Hoc Networks

Jean-Pierre Hubaux, Jean-Yves Le Boudec, Julien Freudiger

In many envisioned mobile ad hoc networks, nodes are expected to periodically beacon to advertise their presence. In this way, they can receive messages addressed to them or participate in routing operations. Yet, these beacons leak information about the n ...

2010

Tracking Games in Mobile Networks

Jean-Pierre Hubaux, Julien Freudiger, Mathias Jacques Jean-Marc Humbert

Users of mobile networks can change their identifiers in regions called mix zones in order to defeat the attempt of third parties to track their location. Mix zones must be deployed carefully in the network to reduce the cost they induce on mobile users an ...

Springer-Verlag New York Inc2010

Integrity of the Web Content: The Case of Online Advertising

Jean-Pierre Hubaux, Julien Freudiger, Nevena Vratonjic

Online advertising is a major source of revenues in the Internet. In this paper, we identify a number of vulnerabilities of current ad serving systems. We describe how an adversary can exploit these vulnerabilities to divert part of the ad revenue stream f ...

2010

Private Sharing of User Location over Online Social Networks

Jean-Pierre Hubaux, Julien Freudiger, Raoul Neu

Online social networks increasingly allow mobile users to share their location with their friends. Much to the detriment of users’ privacy, this also means that social network operators collect users’ lo- cation. Similarly, third parties can learn users’ l ...

2010

Towards Privacy-Friendly Online Advertising

Jean-Pierre Hubaux, Julien Freudiger, Nevena Vratonjic

Modern web sites commonly interact with third-party domains to integrate advertisements and generate revenue from them. To improve the relevance of advertisement, online advertisers track user activities online with third- party cookies. However, excessive ...

2009

A Distortion-based Metric for Location Privacy

Jean-Pierre Hubaux, Julien Freudiger, Reza Shokri, Murtuza Jadliwala

We propose a novel framework for measuring and evaluating location privacy preserving mechanisms in mobile wireless networks. Within this framework, we first present a formal model of the system, which provides an efficient representation of the network us ...

2009

On Non-cooperative Location Privacy: A Game-theoretic Analysis

Jean-Pierre Hubaux, Julien Freudiger, David C. Parkes

In mobile networks, authentication is a required primitive of the majority of security protocols. However, an adversary can track the location of mobile nodes by monitoring pseudonyms used for authentication. A frequently proposed solution to protect locat ...

2009

On the Optimal Placement of Mix Zones

Jean-Pierre Hubaux, Julien Freudiger, Reza Shokri

In mobile wireless networks, third parties can track the location of mobile nodes by monitoring the pseudonyms used for identification. A frequently proposed solution to protect the location privacy of mobile nodes suggests to change pseudonyms in regions ...

Springer2009

Self-Organized Anonymous Authentication in Mobile Ad Hoc Networks

Jean-Pierre Hubaux, Julien Freudiger, Maxime Raya

Pervasive communications bring along new privacy challenges, fueled by the capability of mobile devices to communicate with, and thus "sniff on", each other directly. We design a new mechanism that aims at achieving location privacy in these forthcoming mo ...

2009

Secure vehicular communication systems: design and architecture

Jean-Pierre Hubaux, Julien Freudiger, Maxime Raya, Panagiotis Papadimitratos

2008

On Wireless Social Community Networks

Jean-Pierre Hubaux, Julien Freudiger, Mark Felegyhazi, Peter Marbach

Wireless social community networks are emerging as a new alternative to provide wireless data access in urban areas. By relying on users in the network deployment, a wireless community can rapidly deploy a high-quality data access infrastructure in an inex ...

2008

Wireless Social Community Networks: A Game-Theoretic Analysis

Jean-Pierre Hubaux, Julien Freudiger, Mark Felegyhazi, Peter Marbach

Wireless social community networks formed by users with a WiFi access point have been created as an alternative to traditional wireless networks that operate in the licensed spectrum. By relying on access points owned by users for access, wireless communit ...

2008