A lightweight buyer's trust model for micropayment systems

In this paper we present a trust model for an enhanced version of MR2 micropayment scheme. We named this scheme TMR2. TMR2's light-weight trust model is based on user polling, sales volume and vendor's reputation. We claim that TMR2 can solve the mind barrier problem, which will result in the expansion of micropayment usage. The new token proposed to handle trust is a certificate called Rating certificate. We propose a new Rating certificate for merchants to support users' trust. Our proposed purchase process needs validation of this certificate, therefore, compared to MR2, the proposed scheme needs only one extra on-line digital signature validation. This validation adds less than 4 percent computational overhead in the purchase process, which is acceptable, considering the benefits that users will gain.

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