Advances in security and payment methods for mobile commerce by Wen Chen Hu; Chung-Wei Lee; Weidong Kou

By Wen Chen Hu; Chung-Wei Lee; Weidong Kou

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We now illustrate the importance of these parameters through a number of example scenarios. Copyright © 2005, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. 24 Xiong & Liu Feedback in Terms of Amount of Satisfaction Reputation-based systems rely on feedback to evaluate a peer. Feedback in terms of amount of satisfaction a peer receives during a transaction reflects how well this peer has fulfilled its own part of the service agreement.

S(u,i) is a normalized amount of satisfaction between 0 and 1 that can be computed based on the feedback. Both the feedback and the number of transactions are quantitative measures and can be collected automatically. Different from these two, the third parameter — credibility of feedback — is a qualitative measure and needs to be computed based on past behavior of peers who file feedback. Different approaches can be used to determine the credibility factor and compute the credible amount of satisfaction.

There are a number of known security threats at the wireless communication layer. The reputation system infrastructure has to guarantee the secrecy and integrity of the reputation data during their transmission. Encryption based wireless security solutions such as WAP WTLS4 and PKI 5 schemes can be used in the implementation to ensure reputation data are securely transferred. Bearing these research issues in mind, we developed PeerTrust (Xiong, 2003) as a dynamic and adaptive reputation based trust system for participants or peers to quantify and compare the trustworthiness of each other.

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