A Protocol of Unlinkable Transaction for Preserving Customer Privacy∗

In this paper, we consider the protocol which prevents the service provider from finding out which customer have bought what kind of contents by the unlinkability between the payment and user-profile information. Besides, we do not employ any kind of anonymous payment system causing more computation complexities and overheads to the network, and our approach can be easily applied into the current implemented payment mechanisms. While customer’s privacy is being protected, customers are required to reveal their identities to pay for desired contents and the service provider is able to get the necessary information for its marketing activities. To achieve described above, we design the RSA blind signature-based system architecture that protects the customer privacy for the digital content transaction.