基于代理重签名的电子政务数据安全交换方案

摘要

Considering the security problem of e-government data exchange,a double trapdoor Hash function is proposed by using discrete logarithm assumption.Moreover,this function is proved to satisfy the properties,such as validity,trapdoor collision,collision resistance,key compromise resistance and so on.Combining the proposed Hash function with existing proxy re-signature schemes,a new secure e-government data exchange scheme is presented,and the security of this scheme can be reduced to the security of the trapdoor Hash function and the underlying proxy re-signature scheme.Analysis results show that the proposed scheme can effectively reduce the cost of re-signature generation and resignature verification,enhance real-time data exchange,and reduce storage space.Therefore,the proposed scheme is suitable for devices with limited computing resources.%针对电子政务数据交换的安全问题,基于离散对数设计一个双陷门哈希函数,并证明新函数满足有效性、陷门碰撞、抗碰撞和抗密钥泄露等性质.结合该陷门哈希函数和代理重签名方案,提出一种新的电子政务数据安全交换方案,并证明新方案的安全性可归约到所基于的代理重签名方案和陷门哈希函数的安全性.分析结果表明,新方案的重签名生成和验证开销小,数据交换实时性高,存储空间小,适用于计算资源有限的设备.