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An overview of recent advances in secure peer-to-peer networking is presented, toward enforcing data integrity, confidentiality, availability, and access control policies in these decentralized, distributed systems. These technologies are combined with reputation-based trust management systems to enforce integrity-based discretionary access control policies. Particular attention is devoted to the problem of developing secure routing protocols that constitute a suitable foundation for implementing this security system. The research is examined as a basis for developing a secure data management system for trusted collaboration applications such as e-commerce, situation awareness, and intelligence analysis.