The ubiquity of cellphones has lead to the introduction of location-based services, which are services tailored to the current location of cellphone users. For example, a cellphone user can retrieve a list of interesting, nearby places, or parents are notified when a child (i.e., her cellphone) leaves a boundary area. Location is a sensitive piece of information, so location-based services rais...

We propose an efficient anonymous authentication scheme that provides untraceability and unlinkability of mobile devices, while accessing Location-Based Services. Following other recent approaches for mobile anonymity, in our scheme the network operator acts as an anonymous credential issuer for its users. However, our scheme supports credential non-transferability, without requiring embedded h...

This paper reports on a study of privacy concerns related to location-based services in an airport, where users who volunteer for the service will be tracked for a limited period and within a limited area. Reactions elicited from travellers at a field trial showed 60% feeling to some or to a large degree more secure with the system in operation. To provide a background for the privacy study we ...

The popularity of location-based services (LBSs) leads to severe concerns on users’ privacy. With the fast growth of Internet applications such as online social networks, more user information becomes available to the attackers, which allows them to construct new contextual information. This gives rise to new challenges for user privacy protection and often requires improvements on the existing...

In a straight-forward setup, location-based services have many trust assumptions amongst the involved parties. However, some of the parties may be honest while still being interested in learning confidential information, and others can have reasons to cheat where possible. Therefore, system design needs to account for a less than perfect setting. Research in this area is currently focused on re...

ing Positions for Indoor Location Based Services Teemu Pulkkinen, Sourav Bhattacharya, Petteri Nurmi Helsinki Institute for Information Technology HIIT PO Box 68, FI-00014 University of Helsinki, Finland [email protected]

Location-based services (LBS) provide resources or information based on the user’s own location or an indicated location of interest. This paper introduces a number of data store and access requirements for LBS based on examples from our own work and that of others in the field. We consider specifically the areas of location representation, gathering location data, assets, location-based querie...

This position paper outlines a central question at the intersection of geography and human-computer interaction (HCI): how to evaluate location-based services with users? Systems that incorporate spatial information and adapt their behaviour and appearance depending on where users are located, pose specific challenges for evaluation that differ from applications that are not intrinsically linke...

Within this paper we present an approach on how orientation sensors built into mobile devices can enable a new paradigm for mobile service discovery and use: In conjunction with 3D models of urban terrain, mobile devices can act as virtual pointers to services and information anchored at geographic locations such as buildings or landmarks. We outline a system architecture that enables this new ...

Mobile e-commerce (m-commerce) is defined as all activities related to a commercial transaction conducted through communications networks that interface with wireless (or mobile) devices. It is started recently to appear in the scene by exploiting the advantages of internet, mobile computing and mobile communications in order to provide a large number of advanced services to mobile users. In th...