Institute of Research and Journals (IRAJ)
Multi-agent systems like peer-to-peer networks are widely used for content sharing and searching. However, privacy and security are the concerns with such networks as they are vulnerable to attacks due to open, dynamic and anonymous nature. To protect communications over such networks many models came into existence that are based on the reputation or trust of the peers that interact with each other. However, they cannot cope with the unpredictable behavior of malicious peers.