Title :
P2PFAIR: Fair Exchange in P2P Sharing System without Dedicated TTP
Author :
Luo, Xucheng ; Qin, Zhiguang ; Geng, Ji ; Wu, Chunjiang
Author_Institution :
Univ. of Electron. Sci. & Technol. of China, Chengdu
Abstract :
P2P systems are currently the popular file-sharing platforms. The cooperation mechanism of P2P system can´t offer fair exchange function. Because P2P system is a decentralized system, using a dedicated TTP server to support fair exchange is not suitable. A fair exchange protocol in P2P system without dedicated TTP is proposed, which is called P2PFair. P2PFair offers the fairness and secret guarantee. The fairness is provided by Dis_TTP which is composed of n random peers. P2PFair uses IBE to guarantee the secret of items exchanged. In order to eliminate collusion, Dis_TTP using threshold mechanism to manage the shadows of master key which is generated by distributed key generation algorithm. The threshold mechanism accommodates the fault-tolerant capacity at the same time. According to the probability analysis, the collusion probability is negligible. The protocol analysis shows that P2PFair is an effective solution of fair exchange in P2P sharing systems
Keywords :
cryptography; fault tolerant computing; peer-to-peer computing; protocols; statistical analysis; Dis_TTP; P2P sharing system; P2PFAIR; collusion probability; decentralized system; fair exchange protocol; fault-tolerant capacity; file-sharing platforms; probability analysis; Distributed computing; Distribution functions; Fault tolerance; Fault tolerant systems; Identity-based encryption; Large-scale systems; Peer to peer computing; Protocols; Robustness; Security; P2P computing; fair exchange; identity-based encryption; threshold mechanism;
Conference_Titel :
Communications and Networking in China, 2006. ChinaCom '06. First International Conference on
Conference_Location :
Beijing
Print_ISBN :
1-4244-0463-0
Electronic_ISBN :
1-4244-0463-0
DOI :
10.1109/CHINACOM.2006.344868
