摘要： 利用线性空间码和不经意多项式估值协议构造了一种电子证书及电子证书解密密钥生成方案，在该基础上给出了一种安全的电子软件在线安装方案，从而形成了一种数字版权保护方案。当发生盗版时，数据发行商能够追踪到盗版者，并且可通过更新用户的码向量来废除盗版者的电子证书解密密钥的解密能力，达到维护版权和保护其合法权益的目的，也使该方案具备了动态可撤销性。该方案还具有自身强化性、直接不可否认性和防诬陷性等性能。

关键词: 电子证书；数字版权保护；可撤销性

Abstract: By applying the linear space codes and the oblivious polynomial evaluation protocol, the paper constructs a scheme of generating electronic license and electronic license decryption key. Basing on the scheme, it gives a secure on-line electronic software installation scheme. Thus forms a digital copyright protection scheme. When the piracy occurring, the data supplier can trace the pirate and revoke the decryption ability of the pirate’s electronic license decryption key by updating the code vectors of the users. Reaching the aim of maintaining the digital copyright and protecting its legal right. It also makes the scheme has the character of dynamic revocation. The scheme has some other characters such as self-enforcement, direct non- repudiation, frameproof, and so on.

Key words: Electronic license; Digital copyright protection; Revocation