摘要： 给出了一个新的基于PKI的公钥追踪体制。本体制中数据发布者的公钥长度及每个授权用户的私钥长度都是不变的。为防止授权用户受到诬陷，采用了非对称的用户私钥。以往的追踪体制无法保证授权用户不将自己的私钥有意泄露给他人，文中采用的追踪体制具有自强迫性，可防止授权用户对其私钥的有意泄露。由于用零知识证明的方式对用户在PKI中的密钥进行了验证，该文的体制可防止用户使用非机密信息构造解密密钥。

关键词: 公钥, 私钥, PKI, 追踪体制, 密码体制

Abstract: This paper proposes a new PKI-based public-key traitor tracing scheme. The length of the public-key and that of each users private-key are independent of the number of users. The scheme is built to be asymmetric so as to protect legal users from being framed . Previous traitor tracing schemes cannot protect against a legal user to divulge his/her private key to others , this scheme is a self-enforcement one, so no legal users will give out their private keys willingly. This scheme verifies a users secret-key with the method of zero-knowledge proof , so no user can get a private-key that does not include his/her secret-key in PKI .

中图分类号: 

• TN918.6