Huibin Feng

A Novel Trust Management Model for P2P Network with Reputation and Risk Evaluation

A novel decentralized trust management model with reputation and risk evaluation is proposed (RFTrust). Trust is an essential ingredient of the transaction process. Trust and risk are two closely related factors to make transaction in an uncertain environment. RFTrust model establish the credibility by calculating current reputation and acquiring the risk evaluation which represents the accumulative assessment of the long-term transaction behavior. Simulation and theoretical system show that RFTrust has advantages in combating various malicious behaviors such as dishonest feedbacks from malicious peer, the collusion and the strategic attacks to the trust model itself, and surpasses the current trust models. This model is more robust on trust security and more predominant in successful transaction rate than other trust mechanisms.

Method to Improve the Performance of Common Channel Framework

Common Channel Framework (CCF), a multi-channel mechanism proposed in 802.11s, extends traditional DCF mechanism and is fully compatible with traditional 802.11 WLAN. According to the characteristics of CCF reaching maximum throughput in the state of no assigning common channel to transmit data, a method to improve the performance of CCF is proposed. In one collide field, under the condition of fixed parameters including number of stations, data rate, payload in data frame, without enough channels the improved CCF can also transfer from the state of assigning common channel to the state of no assigning common channel to transmit date and then reach much more throughput.