In the P2P Networks, the guarantee-based trust model, GeTrust is developed by the establishment of trust relationship in human society and aiming at solving the problems of high computational complexity and in accurate evaluations existed in the recommendation-based trust models. In the establishment of the guarantee relationship between the service peer and its guarantee peer(s) on the basis of their mutual evaluations, and then the establishment of a service relationship between the request peer and the service peer based on their mutual evaluations and the guarantee relationship owned by the service peer. The P2P networks mainly focuses on the characteristics like decentralization, autonomy and anonymity. The trust between the peers is established by the concept of reputation and guarantee. A service peer needs to choose its guarantee peer(s) for the service it is going to provide, and they are both required to pledge reputation mortgages for the service. The request peer makes evaluations on all the candidates of service peer by referring their service reputations and their guarantee peers� reputations, and selects the one with highest evaluation to be its service provider. The availability and prevention of malicious behavior, incentive mechanism and anonymous reputation management strategy is proposed. This is an effective and efficient way of improving security and reducing network overhead. Here we also use concept of mortgage of reputation in order to reduce the slander among the peers and provide them best services.The objective is the development of the chat application in the P2P networks in the basis of a trust model when establishing the trust relationships between the peers by the using the concept of Guarantee-based trust model(GeTrust).
Trust and Risk Assessment Model of Popular Software Based on Known Vulnerabilities