Publications by Valtteri Niemi

Inferring Social Ties in Academic Networks Using Short-Range Wireless Communications

Jean-Pierre Hubaux, Kévin Clément Huguenin, Igor Bilogrevic, Murtuza Jadliwala, Valtteri Niemi, Florent Lopez

WiFi base stations are increasingly deployed in both public spaces and private companies, and the increase in their density poses a significant threat to the privacy of connected users. Prior studies have provided evidence that it is possible to infer the ...

2013

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

Jean-Pierre Hubaux, Murtuza Jadliwala, Julien Freudiger, 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

Big Brother Knows Your Friends: on Privacy of Social Communities in Pervasive Networks

Jean-Pierre Hubaux, Imad Aad, Igor Bilogrevic, Murtuza Jadliwala, Valtteri Niemi, Laurent Bindschaedler

Wireless network operators increasingly deploy WiFi hotspots and low-power, low-range base stations in order to satisfy users' growing demands for context-aware services and performance. In addition to providing better service, such capillary infrastructur ...

2012

Track Me If You Can: On the Effectiveness of Context-based Identifier Changes in Deployed Mobile Networks

Jean-Pierre Hubaux, Imad Aad, Igor Bilogrevic, Murtuza Jadliwala, Laurent Bindschaedler, Valtteri Niemi

Location privacy is a major concern in an increasingly connected and highly pervasive network of mobile users. Novel location-based applications and device-to-device services (on these mobile devices) are gaining popularity, but at the same time, these ser ...

Internet Society2012

Privacy-Preserving Activity Scheduling on Mobile Devices

Jean-Pierre Hubaux, Imad Aad, Igor Bilogrevic, Murtuza Jadliwala, Valtteri Niemi

Progress in mobile wireless technology has resulted in the increased use of mobile devices to store and manage users' personal schedules. Users also access popular context-based services, typically provided by third-party providers, by using these devices ...

ACM2011

Meetings through the Cloud: Privacy-Preserving Scheduling on Mobile Devices

Jean-Pierre Hubaux, Imad Aad, Igor Bilogrevic, Murtuza Jadliwala, Valtteri Niemi

Mobile devices are increasingly being used to store and manage users' personal information, as well as to access popular third-party context-based services. Very often, these applications need to determine common availabilities among a set of user schedule ...

Elsevier2011

Privacy-Triggered Communications in Pervasive Social Networks

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

2011

Methods for efficient certificate revocation list compression

Serge Vaudenay, Rafik Chaabouni, Imad Aad, Valtteri Niemi, Atefeh Mashatan

A method for providing efficient management of certificate revocation may comprise storing a list of identifiers of digital certificates including a revocation list defining a list of revoked certificates in an accumulator, storing a witness value in assoc ...

2010