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中文摘要：
提出一种新的基于双线性映射的公钥叛逆者追踪方案．同已有方案相比较，主要贡献是同时实现了以下特性：1）用户存储的解密钥长度和广播的分组长度与用户数量无关；2）完全抗共谋性，任意用户不能通过共谋构造出另一个不同的解密钥；3）完全撤销性，能够在不更新合法用户密钥的前提下，同时撤销任意选择的用户；4）完全恢复性，对于任意选择的已撤销用户，不需要对其密钥进行更新即可同时恢复其解密能力．方案的安全性是基于有限域上解离散对数问题和判定性Defile-Helleman（DDH）问题为困难问题．
英文摘要：
Traitor tracing schemes are used to fight piracy when distributing securely some data to multiple authorized receivers. By traitor tracing schemes, at least one authorized user will be found from those who collude and share their decryption keys to unauthorized users. Based on bilinear map a new public-key traitor tracing scheme is presented in this paper. The main contribution of this scheme is that it concurrently satisfies the following features： 1） Both the number of keys stored by a user and the length of broadcasted block data are independent of the number of users. 2） Full collusion resistance： no users can construct a different valid decryption key from themselves by coalition. 3） Full revoke： any selected users can be revoked without renewing the others＇ decryption keys. 4） Full recoverability： any revoked users can he recovered without renewing their decryption keys. Most importantly, compared with the existing schemes that satisfy the above properties, the translation overhead and storage overhead in the new scheme are independent of the total number of users. Finally, in the scheme presented any sets of users can be treated as authorized users. The security of this scheme is based on the difficult problems of solving discrete logarithm problem and decision Diffie-Hellman problem （DDH）.
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