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The protection of wireless sensor networks is an important task, especially for critical situations such as intrusion detection, tamper monitoring, or military applications. To date, much of the emphasis on protecting sensor networks has focused on key management and secure routing. However, as sensors become more capable and ubiquitous, the need for more fine-grained control over their resources grows. In this paper, we present a security policy for wireless sensor networks which provide designers and administrators the ability to fine-tune access to sensor resources. We build on the notion of group-based key establishment to show how group membership can be utilized in deploying a dynamic, robust, and flexible security policy for wireless sensor networks.

Abstract-As the use of personal information in social network sites seems manifold, including the representation of an individual's digital persona (or social role) and identification, so does the abuse or misuse of the information. The issue of privacy is critically important in this context. In this paper we present a novel framework for enabling user-controlled sharing of sensitive personal information for better privacy protection in current online social networks. Specifically, the framework called U-Control is proposed to facilitate digital persona and privacy management (DPPM) in a user-centric way that it can satisfy diverse privacy requirements and specification, and social network environments. We discuss the design of a security system based on the proposed framework. Finally we discuss a proof-of-concept implementation, along with performance evaluation.

User privacy is a challenging issue that must be addressed urgently in current online social networking (SN) sites. One of the fundamental problems associated with the issue is the lack of support of a user-centric approach to managing and sharing user profile information in current SN systems. In this paper we present a user-centric approach based on a credential system to enabling a user-controlled attribute (persona) sharing in online SN sites. Specifically we extend a Google-initiated open source project called OpenSocial, which provides a framework to support user attribute sharing between gadgets and online SN sites, in order to allow users to selectively share their attributes among online SN sites. This paper details the design and implementation of our extension.

In recent years user centricity has drawn a lot of attention as a promising component to advance federated identity management (FIM) systems. The basic notion is to give users a larger degree of control over their attribute data that comprises digital identities on a federated network, thus providing an ideal mechanism for upholding user privacy. One of the fundamental problems facing user centricity in this context is how a user can selectively share her identity attributes certified by an identity provider (IdP) to a service provider (SP). In this paper we present an approach to addressing the problem, which allows a user to share only selected attributes from a larger set of attributes that form his digital identity credential for better privacy. Our approach enables such sharing to occur without IdP's intervention in every transaction.