T. Shojima, Y. Takada, N. Komoda, H. Oiso, and A. Hiramatsu (Japan)
P2P, incentive, electronical coupon, distribution history
An incentive attached peer to peer (P2P) electronical coupon system is proposed. This system intends users to forward the e-coupon, in order to deliver the e-coupon to the potential users. To activate delivery of the e-coupons, incentives are given to the users who acted as mediators. To provide incentives, it is necessary to acquire the distribution history of the e-coupon. Furthermore, it is expected that illegal acts occur, such as interpolation or destruction of the distribution history to get incentives for himself/herself, and the distribution of the e-coupon with the interpolated contents which prevents other users from using it at retail stores. Therefore, the distribution history attached to the e coupon is enciphered with a public-key crypto system so that users cannot peruse the distribution history. Further more, a message digest (MD) of the distribution history is embedded by digital-watermarking technology to check the validity of the history. A prototype system based on these mechanisms has been developed using PDAs as mobile devices and infrared data association (IrDA) connection for coupon data ex change. The e-coupon is described by XML. Through the experiment of the prototype system, it is confirmed that the proposed prevention mechanisms of illegal acts are func tional.
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