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The reliability of location-based services (LBS) is strongly dependent on the accuracy of the location of the users. However, existing LBS systems are not able to efficiently validate the position of users in large-scale outdoor environments, leading to possible location spoofing attacks by malicious users. To this end, we present an efficient and scalable Location Validation System (LVS) that secures...
In this paper we show how deductive and abductive reasoning in distributed authorisation can be efficiently ported to Android. Such logical-inference processes prove to be important tools due to the intrinsic autonomic-nature of these mobile devices. Both deduction and abduction are represented by using Constraint Handling Rules (CHR), a high-level declarative constraint programming-language, and...
In usage control, access decisions rely on mutable attributes. A reference monitor should reevaluate security policies each time attributes change their values. Identifying all attribute changes in a timely manner is a challenging issue, especially if the attribute provider and the reference monitor reside in different security domains. Some attribute changes might be missed, corrupted, and delayed...
In Usage CONtrol (UCON) access decisions rely on mutable attributes. A reference monitor should re-evaluate security policies each time when attributes change their values. Catching timely all attribute changes is a challenging issue, especially if the attribute provider and the reference monitor reside in different security domains. Some attribute changes might be missed, corrupted, and delayed....
Usage control model (UCON) is based on the idea that attributes required for decision-making can be changed over a period of usage. Since it is not always possible to get a fresh and trustworthy value of attributes, a decision has to be done with some uncertainties in mind. Moreover, modern systems become more distributed and dynamic and this evolution aggravates the problem. Such trend demands for...
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