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Users and resources in online social networks (OSNs) are interconnected via various types of relationships. In particular, user-to-user relationships form the basis of the OSN structure, and play a significant role in specifying and enforcing access control. Individual users and the OSN provider should be enabled to specify which access can be granted in terms of existing relationships. In this paper,...
Most cloud services are built with multi-tenancy which enables data and configuration segregation upon shared infrastructures. Each tenant essentially operates in an individual silo without interacting with other tenants. As cloud computing evolves we anticipate there will be increased need for tenants to collaborate across tenant boundaries. This will require cross-tenant trust models supported and...
In a provenance-aware environment, as data objects are created and used, the transaction information is captured as provenance data. Provenance-based access control utilizes the captured provenance information to control access to the underlying data. In a group-centric collaboration environment, data objects are shared and modified by multiple organizations/systems while the relevant provenance data...
This paper motivates the fundamental importance of application context for security. It then gives an overview of the PEI framework for application-centric security and outlines some of the lessons learned in applying this framework. PEI stands for Policy, Enforcement and Implementation, signifying three distinct layers at which security policy and design decisions need to be made. The framework was...
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