Asymmetric Fingerprinting Protocol Based on RSA Public Key System
A kind of digital work commerce protocol is proposed based on RSA public key system. From the protocol,the user needs to transfer a random variables string to the publisher after it encrypted by public key,where the random variables,as a mark of identity,are generated under some certain constraint conditions. First be scrambled,and then be calculated with the digital work that encrypted with the user's public key,the data transferred from the user will be sent to the user by the publisher. The user can obtain a digital work with fingerprint after decryption,but the fingerprint cannot be deleted. While the publisher cannot obtain this digital work,but can judge whether there exists fingerprint information in illegal copied digital work. Hence this can be utilized in tracing and accusing the illegal piracy. Meanwhile,it can also protect legal user from framed by publishers. The third party is avoided in digital fingerprint identification with better performance in preventing forgery in the procedure.