摘要： 分析了现有数字指纹技术，将环签名与数字指纹相结合，基于椭圆曲线密码提出了一类非对称的匿名数字指纹方案。该方案实现了购买者的匿名性与指纹信息的非对称性，有效地保护了用户与商家的隐私信息，必要时又可对匿名身份实施追踪，避免了可信第三方的安全假设及指纹信息前后关联的缺陷，防止了对数字指纹进行联合攻击和广义伪造攻击的安全隐患。

关键词: 匿名数字指纹, 环签名, 概率加密, 身份盲化, 椭圆曲线密码

Abstract: Analyses are made on the security threats of present digital fingerprinting schemes, and an asymmetric digital fingerprinting scheme with conditional anonymity based on ring signature is presented. The identity blinding process enables buyers to be conditionally anonymous, and the anonymity can also be revoked if necessary. The probabilistic encryption algorithm in the scheme avoids the relevance between different digital fingerprints generated by the same buyer. The independence of fingerprint security on the hypothesis of an absolutely trustable third party in the scheme prevents coalition attack and generalized fingerprint forgery.

Key words: anonymous digital fingerprint, ring signature, probabilistic encryption, identity blindness, elliptic curves cryptosystem

中图分类号: 

• TP393.08