1. 1 A Collaboration Scheme for Making Peer-to-Peer Anonymous Routing Resilient Authors: X. Wang and J. Luo Source: 12th International Conference on Computer Supported Cooperative Work in Design, pp. 70-75, 2008 Speaker: Shu-Fen Chiou ( 邱淑芬 )

2. 2 Motivation AB G D C E F initiator responder a.mp3

3. 3 Approach Initiator anonymous protocol. Using Friendly Neighbor-based Incentive (FNI) improve the fragile path. Re-encryption mechanism for replacing failed relay nodes to improve routing resilience.

4. 4 FNI mechanism AB G D C E F initiator responder 0.8 0.7 1:excellent neighbor 0:colsed friend 0.3 0.7 0.85 0.75

5. 5 Increase its rating value Increasing answering power. Increasing the number of edges. Increasing the amount of capacity used to service neighbors ’ queries. Increasing the length of period for servicing neighbors ’ queries.

6. 6 Onion routing AB G D C E F initiator responder a.mp3 Onion A-G Onion G-D Onion D-F 0.8 0.7

7. 7 Failed node AB G D C E F initiator responder a.mp3 Onion A-G Onion G-D Onion D-F 0.8 0.7 0.6 Onion G-B Re-encryption key K D-B

8. 8 Security analysis N: number of nodes in the system. F: fraction of malicious nodes that collaborates each other. L: number of relay nodes on a path. The probability a node x is the initiator I is:

9. 9 Experimental results

10. 10 Comments Mutual anonymous Security consider Re-encryption mechanism Initial rating