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1 P2P Reputation Management Using Distributed Identities and Decentralized Recommendation Chains Authors: P. Dewan and P. Dasgupta Source: IEEE Transactions.

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Presentation on theme: "1 P2P Reputation Management Using Distributed Identities and Decentralized Recommendation Chains Authors: P. Dewan and P. Dasgupta Source: IEEE Transactions."— Presentation transcript:

1 1 P2P Reputation Management Using Distributed Identities and Decentralized Recommendation Chains Authors: P. Dewan and P. Dasgupta Source: IEEE Transactions on Knowledge and Data Engineering, vol. 22, no. 7, pp , 2010 Speaker: Shu-Fen Chiou ( 邱淑芬 )

2 2 Outline Introduction Proposed method Experimental results Conclusions Comments

3 3 De-centralized P2P Architecture Query abc.mp3 abc.mp3 REC: 0.3 REC: -0.5 REC: 0.6REC: 0.65

4 4 Problem 8 8’8’ 8’8’ 8’8’ 8’8’ 8’8’ False transaction REC=0.3-> Query abc.mp3 abc.mp3 REC: 0.8 REC: -0.5 REC: 0.6 REC: 0.3 liar farms

5 5 Contributions A self-certification-based identity system protected by cryptographically blind identity mechanisms. A light weight and simple reputation model. An attack resistant cryptographic protocol for generation of authentic global reputation information of a peer.

6 6 Proposed method P CA Request certificate Search file or service Get list and decide the provider with the highest reputation Verify, get file or service, and feedback reputation (Recommend)

7 7 Proposed method Peer (P) Authority (A) B1, I Alice B2 P K1, P K2 A K1, A K2 B1={EB Ka (I Aliceτ )} B2=E A K2 {EB Ka (I Aliceτ )} E A K2 {I Aliceτ }={EB Ka {B2}} Certification request

8 8 Proposed method Requester (R) Provider (P) RTS, IDR IDP, TID, E P K2 (H(TID||RTS)) P K1, P K2 Search for network: Search(P K1 ||TID) LTID=Max(Search(PK1||TID)) Check LTID

9 9 Experimental Results

10 10 Experimental Results

11 11 Conclusions Presents self-certification, an identity management mechanism, reputation model, and a cryptographic protocol. The self-certification-based identity generation mechanism reduces the threat of liar farms.


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