Blind Signature and Its Application in Digital Fingerprint

The paper analyzed the basic principles of blind signature and its application in designing and analyzing digital fingerprint schemes. Combining blind signature and anonymous fingerprint, we present a digital fingerprint scheme with conditional anonymity based on ECC (elliptic curves cryptosystem). The identity blinding and probabilistic encryption algorithm enable the buyer to be conditionally anonymous in fingerprint embedding and commodity purchasing, and the anonymity can also be conveniently revoked if necessary. The scheme achieves effective supervision on fingerprint generating and identity tracing, avoids the misuse of commerce and identity tracing in electronic business. The scheme prevents coalition attack and generalized fingerprint forgery of purchaser with other protocol parties. We also provide an application case of the anonymous fingerprint scheme in electronic commodity purchasing and copyright supervision, it further justify the scheme´s brevity, security, high efficiency considering its application in software and hardware circumstances.