Secure Mobile Agent Digital Signatures with Proxy Certificates
E-Commerce Agents, Marketplace Solutions, Security Issues, and Supply and Demand
Unlinkable Electronic Coupon Protocol with Anonymity Control
ISW '99 Proceedings of the Second International Workshop on Information Security
Anonymous Fingerprinting Based on Committed Oblivious Transfer
PKC '99 Proceedings of the Second International Workshop on Practice and Theory in Public Key Cryptography
EUROCRYPT'97 Proceedings of the 16th annual international conference on Theory and application of cryptographic techniques
An improved protocol for demonstrating possession of discrete logarithms and some generalizations
EUROCRYPT'87 Proceedings of the 6th annual international conference on Theory and application of cryptographic techniques
Coin-based anonymous fingerprinting
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
An anonymous buyer-seller watermarking protocol with anonymity control
ICISC'02 Proceedings of the 5th international conference on Information security and cryptology
A buyer-seller watermarking protocol
IEEE Transactions on Image Processing
IWDW '07 Proceedings of the 6th International Workshop on Digital Watermarking
Cryptanalysis of a generalized anonymous buyer-seller watermarking protocol of IWDW 2004
EUC'05 Proceedings of the 2005 international conference on Embedded and Ubiquitous Computing
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Buyer-seller watermarking schemes enable sellers to identify the buyer of illegally distributed contents by providing each buyer with a slightly different version. To protect the privacy of buyers, buyers' purchase should be done anonymously, and unlinkability of contents purchased should be satisfied. In this paper, our concern is to generalize a buyer-seller watermarking protocol to multi-purchase environments. The problem of most schemes in the literature is that the number of keys held by buyer's devices increases in proportion to that of contents purchased, if we apply it to multi-purchase case. Otherwise, they cannot provide unlinkability. We propose an efficient multi-purchase buyer-seller watermarking protocol satisfying anonymity and unlinkability, where a buyer executes registration step one time and the number of buyer's necessary key is also one regardless of that of contents. Our second concern is to extend this scheme to the mobile communications. Our scheme reduces amount of buyers' computations to the minimum by introducing a concept of mobile agents.