Trust Path-Searching Algorithm Based on PSO

As there are many malicious nodes spreading false information in P2P networks, it is of great importance to build a sound mechanism of trust in the P2P environments. To avoid the shortage of the existing trust model, this paper provides a Trust Path-Searching Algorithm based on PSO. In this algorithm, after initializing the particle swarm, each particle can update its speed and location according to its information, and then produce a new particle with better value. Doing that process continuously, implementing the global search of the space, finally, we can get a better overall value, which is the better trust path in the networks. The simulation results show that it can get the overall optimum solution in a relatively short time after many times of iteration, and the more times it iterates, the better the trust path is. It can be proved that to a certain extent, the algorithm can prevent the fraud.