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为了达到群组签密的目的以及使得群组签密具有代理功能,利用双线性配对的特性结构及基于属性的密码体制结构,构建出一个基于属性的代理签密方案。其中,将文件用属性集来标识,私钥由访问控制结构来产生,用来控制签密、代理签密和解签密的权限范围。该方案既保持了基于属性签密的优点,又具有代理签名的功能,且具有公开验证性、强可识别性及强不可否认性。最后,对方案进行了安全性分析。
In order to achieve the purpose of group signcryption and group signcryption with proxy function, a property-based proxy signcryption scheme is constructed by using the property structure of bilinear pairing and the property structure of the cryptosystem. Among them, the file with the attribute set to identify the private key generated by the access control structure, used to control the signcryption, proxy signcryption and signcryption authority range. The scheme not only retains the advantages of attribute-based signcryption, but also has the function of proxy signature, and has the public verification, strong identifiability and strong non-repudiation. Finally, the security analysis of the program.