摘要： 为解决现有门限代理签名方案存在的安全隐患，结合离散对数问题，提出一个基于RSA密码体制的门限代理签名方案。理论分析结果证明，该方案可以防止原始签名人的内部攻击和代理签名人的内部合谋攻击，满足不可否认性、可认证性和可识别性等安全性要求，且具有较低的运算和通信量。

关键词: 代理签名, 门限代理签名, RSA密码体制, 离散对数, 合谋攻击

Abstract: By using discrete logarithm method, this paper proposes a RSA-based threshold proxy signature scheme based on the security problems of previous RSA-based threshold proxy signature scheme. Analysis results show that the new scheme can resist the original signer’s insider attack and the proxy signers’ conspiracy attack. Besides, the new scheme satisfies non-repudiation, verifiability, recognizability and other security requirements. And it has the advantages of simplicity of signing process, and low communications.

Key words: proxy signature, threshold proxy signature, RSA cryptosystem, discrete logarithm, conspiracy attack

中图分类号: 

• TP309.2