Toward reputable Grids

The Grid approa h provides a vision to a ess, use, and manage heterogeneous resour es in virtual organizations a ross multiple domains and organizations. This paper foremost analyses some of the issues related to establishing trust and reputation in a Grid. Integrating reputation into quality management provides a way to reevaluate resour e sele tion and servi e level agreement me hanisms. We introdu e a reputation management framework for Grids to work toward fa ilitating the omplex task of improving the quality of resour e sele tion. Based on ommunity experien e we adapt trust and reputation of entities through spe ialized servi es. Simple ontextual quality statements are evaluated in order to ee t the reputation for a monitored resour e. Additionally, we introdu e a novel algorithm for evaluating Grid reputation by ombining two known on epts using eigenve tors to ompute reputation and integrating global trust. 1. Introdu tion. The Grid approa h [18, 21 ℄ provides a vision to develop an environment for oordinated resour e sharing and problem solving in dynami , multi-institutional virtual organizations under quality-of-servi e onstraints [5, 10℄. However, optimal use of these distributed servi es and resour es requires not only knowledge about the apabilities of the resour es, but also the assuran e that the available and requested apabilities an be used su essfully. Grid users are fa ed with questions su h as whi h resour es are available remotely, whi h apabilities these resour es have, whether one is authorized to use these resour es, whether the information for a resour e sele tion is a urate, and on whi h resour es a task is likely to exe ute with the mos