Abstract: Using the theory of the bilinear pairings on elliptic curve mapping and identity-based cryptography, this paper proposes a new identity-based threshold proxy signature scheme. The new scheme uses a method that a trusted private key generation center generates and manages private keys, avoiding complex problems of management that caused by using certificates. This paper carries out that the scheme satisfies the distinction, verifiability, strong unforgeability, strong recognizability, strong non-repudiation and analysis of other security features. It shows that the new scheme is secure and effective.

Key words: identity-based, public key cryptosystem, proxy signature, threshold proxy signature, bilinear pairings, Diffie-Hellman group

摘要： 运用椭圆曲线上的双线性对映射及基于身份的密码体制理论，提出一种新的基于身份的门限代理签名方案。该方案采用一个可信任的私钥生成中心生成并管理私钥，避免因使用证书而产生的复杂管理问题，从而降低管理成本，同时对该方案进行可区分性、可验证性、强不可伪造性、强可识别性、强不可否认性等安全特性分析，结果表明，该方案是安全有效的。

关键词: 基于身份, 公钥密码体系, 代理签名, 门限代理签名, 双线性对, Diffie-Hellman群

CLC Number: 

• TP309