On blind signatures and perfect crimes
Computers and Security
Communications of the ACM
Anonymity Control in E-Cash Systems
FC '97 Proceedings of the First International Conference on Financial Cryptography
Marking: A Privacy Protecting Approach Against Blackmailing
PKC '01 Proceedings of the 4th International Workshop on Practice and Theory in Public Key Cryptography: Public Key Cryptography
Group Blind Digital Signatures: A Scalable Solution to Electronic Cash
FC '98 Proceedings of the Second International Conference on Financial Cryptography
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In this paper we present a multiple bank electronic cash system based on group blind signature scheme, which offers a new kind of tracing mechanism. It provides conditional anonymity both for the customers and electronic coins under a judge. The coins can be marked using undeniable signature scheme so that the bank will recognize these coins at deposit. We also use the secret sharing scheme to trace the customer under the permission of a judge. The security of our scheme is analyzed. And compared with other works, our proposed tracing methods offer more privacy and do not need any trusted third parties. Our system is able to prevent from blackmailing, kidnapping, and bank robberies. Also we extend electronic cash system to multiple banks, it is more practical in the real life.