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We take a detailed look at how users, while focusing on non-permission tasks, notice and fix access-control permission errors depending on where the access-control policy is spatially located on a photo-sharing website. The access-control policy was placed on an online photo-sharing website under the photo or album, on the sidebar, or on a separate settings page. We find that placing the access-control...
The increasing need to share information in dynamic environments has created a requirement for risk-aware access control systems. In this paper, we present a metamodel for risk-aware authorization that captures the key aspects of a system in relation to risk mitigation. In particular, we develop various risk-aware models as instances of the metamodel that broadly differ in the form of risk mitigation...
Online dating is one domain, which would benefit from the application of computational trust. One of the problems with the application of traditional computational trust models, as identified in our previous work, is authenticity of information provided by parties which helps other users ascertain whether they want to go on dates. In this position paper, we suggest a solution: a concordance based...
There is a serious robust issue of building Reputation Systems for travel-related services, such as hotel, restaurant, etc. This paper proposes an advanced clustering approach, Suspicion Degree Meter (SDM), to rank suspects with respect to manipulative behavior. The detection process proceeds on different layers, review layer, traveller layer and hotel layer. Regarding two types of manipulative behavior,...
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