Component based trust management in the context of a virtual organization
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A Virtual Organization (VO) is a dynamic collection ofdistributed resources that are shared by a dynamiccollection of users from one or more physicalorganizations. As Grid Computing technology is startingto facilitate truly large-scale VOs, issues are being raisedregarding the purpose, architecture and operationalmechanism of the VO. The emerging approach isessentially to define the VO as a particular set of users,whereby a "VO server" issues tokens to humans attestingto their membership in the VO. The problem with thisapproach is that there is little in the way of rules thatdescribe the operation of the virtual organization or rulesthat govern the behavior of VO users and resources (andthe ramifications of failing to meet the intent of the VOitself). Where such rules exist, they are implicit andtherefore difficult to enforce in a consistent or automatedmanner. This paper identifies two representative policiesfor existing and future VOs and, more generally,identifies issues and approaches for addressing thepractical concerns for implementing any explicit VOpolicy: utilization measurement, accounting, enforcementconditions, enforcement actions, and security. Aprototype implementation using .NET is described.