A Group-Choose Model for Partner Selection in Virtual Organization

Most of the existing trust models don´t perform well in preventing malicious nodes from profiteering by conspiracy attack or periodic attack, and pay little attention to incentive mechanisms in the environment of Virtual Organization (VO). This paper proposes a new distributed trust mechanism in Single-core VO, which chooses the new node by Group-Choose mechanism that aggregates direct trust (Direct Trust) and 3rd-party assessment from every group member, in order to solve the problem of selecting a specific set of services. The Direct Trust iteratively calculates trust value with a dynamic adaptive parameter. The 3rd-party assessment method is based on credibility of evaluation. Group-Choose mechanism aggregates trust evaluations of the central node and existing members in the group to select the next member. Compare with Path Trust and Peer Trust, Group-Choose mechanism has better performance in resisting conspiracy attack and periodic attack and increasing the group success rate.