1. 1 A secure model for controlling the hubs in P2P wireless network based on trust value Authors: Y. Liu, N. Xiong, K. Xu, J. H. Park, and C. Lin Source: Computer Communications, vol. 33, pp. 997-1004, 2010 Speaker: Shu-Fen Chiou ( 邱淑芬 )

2. 2 Free riders 0 1 2 3 Free rider

3. 3 Concepts High trust value and low connections can get better quality of service. Prevent free riders

4. 4 Proposed method

5. 5 VaVa Direct trust value

6. 6 Proposed method VaVa Recommend trust value

7. 7 Proposed method Trust value VaVa

8. 8 Proposed method Select resource provider VaVa 

9. 9 Simulation results

10. 10 Comments The free riders can not respond the request msg. Only the initiator considers the trust value of resource provider.