基于可转化环签名的匿名买方-卖方水印协议（英文）

An Anonymous Buyer-Seller Watermarking Protocol Based on Convertible Ring Signature

提出一种基于可转化环签名的匿名买方-卖方数字水印协议.该协议采用改进的可转化环签名,对管理员权利进行有效约束.匿名证书与环签名一同保证了所有参与者的合法性.在该协议中,水印在加密状态下被嵌入,任何参与者都无法得知水印内容,因此协议可以抵抗合谋攻击.同时,由于数字内容只传递一次,传输成本得到降低.本协议还有效解决了匿名问题、未绑定问题、隐私追踪问题以及中间人攻击问题.分析表明,新协议安全有效,可以抵抗常见攻击.

An anonymous buyer-seller watermarking protocol based on convertible ring signatures is proposed in this paper.An improved convertible ring signature is used to restrict the power of administrators effectively.The legitimacy of all participants is guaranteed by using anonymous certificate and ring signature.In this protocol,none of participants knows the watermark as it is embedded in encrypted state.The collusion attacks are prevented.What＇s more,the high transmission cost problem is solved as the digital content is transmitted only once.The anonymity problem, unbinding problem, piracy tracing problem and middle attacks problem can also be solved by using the protocol.Analysis shows the new protocol is safe and effective to resist attacks.