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With increasing opportunities for cheaper outsourcing of data, more and more organizations are seriously considering this option to reduce storage and processing costs. However, it has also given rise to the possibilities of security and privacy violations of data in outsourced environments. In this paper, we look at the privacy aspect, often referred to as data confidentiality. Our solution employs...
We do a survey of some of the most important principles of anonymization present in the literature. We identify different kinds of attacks that can be thrown against an anonymized dataset and give formulas for the maximum probability of success for each. For each principle, we identify whether it is monotonous, what attacks it is suited to counter, if any, and what principles imply other principles...
Relationshion-based access control (ReBAC) is today emerging as a de-facto standard for On-line Social Network (OSN) access control. However, although several proposals exist of ReBAC models, no extensive performance evaluations have been conducted so far. In this paper, we carried out several experiments on different datasets to study the overhead implied by ReBAC and how it scales when increasing...
Participatory applications provide users with value-added and reusable information; however, collection of this information comes at the expense of the participants' privacy. Preserving the mobile participants' privacy is a key concern of mobile computing. This paper outlines current participatory application system model, privacy weaknesses, and existing privacy enhancing technologies. Next, it proposes...
Location-Based Social Network Systems (LBSNSs) are becoming increasingly popular. In LBSNSs, users can check in at various places, connect with their friends and share their check-ins (including users' locations and timestamps) with their friends and even the public. However, most LBSNSs pay on more attention to attracting users to join and actively use their systems rather than protecting users'...
Driven by the success of Social Software in private and enterprise settings (Web 2.0 / Enterprise 2.0) a lot of specialized services have moved mainstream over the last few years. Thus, the number of services one single person uses in cooperative settings for different dedicated purposes, e.g. joint document editing, group calendars, microblogs or Social Networking Services (SNS) has highly increased...
Current approaches for enforcing fine-grained access control and confidentiality to sensitive data hosted in the cloud are based on selectively encrypting the data before uploading it to the cloud. In such an approach, organizations have to enforce authorization policies through encryption. They thus incur high communication and computation cost to manage keys and encryptions whenever user credentials...
An increasing number of Americans use social networking sites such as Facebook, but few fully appreciate the amount of information they share with the world as a result. Although studies exist on the sharing of specific types of information (photos, posts, etc.), one area that has been less explored is how Facebook profiles can share personality information in a broad, machine-readable fashion. In...
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