Trust, Disconnection, Minimizing risk and Apathy

Minimizing Trust Leaks for Robust Sybil Detection

Sybil detection is a crucial task to protect online social networks (OSNs) against intruders who try to manipulate automatic services provided by OSNs to their customers. In this paper, we first discuss the robustness of graph-based Sybil detectors SybilRank and Integro and refine theoretically their security guarantees towards more realistic assumptions. After that, we formally introduce adver...

Cost-minimizing risk adjustment.

Conventional risk adjustment, which sets capitation payments equal to the average cost of individuals with similar observable characteristics, is not optimal if health plans can use private information to select low-cost enrollees. "Cost-minimizing risk adjustment" minimizes the sum of capitated HMO premiums plus FFS costs by balancing the gains from HMO cost efficiency against the overpayments...

Trust and Risk

Philosophical conceptions of the relationship between risk and trust may be divided into three main families. The first conception, taking its cue from Hobbes, sees trust as a kind of risk assessment involving the expected behavior of another person, for the sake of achieving the likely benefits of cooperation. The second conception of trust sees it as an alternative to calculative risk assessm...

Disconnection and Responsibility

Usage Control, Risk and Trust

In this paper we describe our general framework for usage control (UCON) enforcement on GRID systems. It allows both GRID services level enforcement of UCON as well as fine-grained one at the level of local GRID node resources. In addition, next to the classical checks for usage control: checks of conditions, authorizations, and obligations, the framework also includes trust and risk management...