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A Secure Universal Loyalty Card

In this paper, we propose a generic loyalty system based on smart cards which may be implemented in existing devices like cell phones or PDAs. Our loyalty system is secure and offers some desirable features both to customers and vendors, and may further the adoption of such win-win marketing operations. In particular, the system, reliable for both parties, is universal in the sense that there is a one-to-many relationship between a customer’s loyalty card and the vendors.