一种无第三方参与的匿名指纹方案

Anonymous Fingerprinting Scheme without Third Party

数字指纹在版权保护方面有着非常重要的作用,它能使销售商在收缴到非法拷贝后追踪出真正的盗版者。已有的数字指纹方案可分为:对称指纹方案、非对称指纹方案、匿名指纹方案三类。其中只有匿名数字指纹能对购买者的真实身份进行保密。绝大多数现有的匿名指纹方案在实现上都需要可信第三方的参与,以颁发证书及恢复非法盗版者的真实身份。基于类E lGamal加密算法提出一种不需要可信第三方参与的匿名数字指纹方案,本方案执行过程简单,具备不可联系性。方案的安全是基于有限域上计算离散对数为困难问题,因此方案的安全是有保证的。

Digital fingerprinting plays an important role in digital copyright protection. It helps the merchants catch the real pirates after they get the illegal copies. In general, anonymous fingerprinting schemes are classified into three different classes called symmetric fingerprinting schemes, asymmetric fingerprinting schemes, and anonymous fingerprinting schemes. The real identity of buyers can be concealed only in anonymous fingerprinting schemes. Most of anonymous fingerprinting proposed need the trusted third party in order to issue certifications for buyers and reveal the real identify of pirate. Based on E1Gamal-like algorithm, this paper presents an anonymous fingerprinting scheme without the trusted third party, moreover, this scheme has advantages of unlinkability and simple in process. The safety of this scheme is on the ground of the intractable problem of solving the discrete logarithm in finite field, therefore, this scheme is strong safety.