Extensions of single-term coins
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
EUROCRYPT '93 Workshop on the theory and application of cryptographic techniques on Advances in cryptology
CCS '94 Proceedings of the 2nd ACM Conference on Computer and communications security
Applied cryptography (2nd ed.): protocols, algorithms, and source code in C
Applied cryptography (2nd ed.): protocols, algorithms, and source code in C
Privacy: how much data do direct marketers really need?
Computerization and controversy (2nd ed.)
Handbook of Applied Cryptography
Handbook of Applied Cryptography
An Efficient Electronic Payment System Protecting Privacy
ESORICS '94 Proceedings of the Third European Symposium on Research in Computer Security
CRYPTO '91 Proceedings of the 11th Annual International Cryptology Conference on Advances in Cryptology
Wallet Databases with Observers
CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
An Efficient Divisible Electronic Cash Scheme
CRYPTO '95 Proceedings of the 15th Annual International Cryptology Conference on Advances in Cryptology
Efficient Electronic Cash with Restricted Privacy
FC '97 Proceedings of the First International Conference on Financial Cryptography
Group Blind Digital Signatures: A Scalable Solution to Electronic Cash
FC '98 Proceedings of the Second International Conference on Financial Cryptography
An Efficient Off-line Electronic Cash System Based On The Representation Problem.
An Efficient Off-line Electronic Cash System Based On The Representation Problem.
Customer Service: A Practical Approach
Customer Service: A Practical Approach
A privacy-protecting coupon system
FC'05 Proceedings of the 9th international conference on Financial Cryptography and Data Security
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Loyalty program is a marketing effort by the merchant to keep customers loyal to their stores. It tries to keep track of the purchasing-behavior of a customer by recording customer's purchase information, including his credit card number, as a key identifier to the customer. While it may benefit the customer, the drawback is that the privacy of the customer is intruded. If the customer is using an anonymous payment system such as electronic cash / digital coins, his privacy is protected, but he will not get any benefit from the loyalty program which tries to record his payment information. This paper suggests several solutions to solve merchant's need to gather statistical data from customer's purchasing behavior versus customer's need for privacy. Among the solutions, we present the idea of blindly signed pseudo digital certificates, which satisfies our requirement for a loyalty program scheme with an anonymous payment system.