基于身份的多重代理签名的安全模型

多重代理签名是代理签名的重要的扩展形式。它允许一个原始签名人把他的签名权委托给一组代理签名 人，只有所有的代理签名人合作才能产生有效的代理签名。将多重代理签名与基于身份的密码学结合起来，人们提出 了一些基于身份的多重代理签名方案。不过，迄今为止还没有提出基于身份的多重代理签名的安全模型。文章给出 了基于身份的多重代理签名的形式化定义和安全模型。

Formalized Security Model of Identity Based Multi-Proxy Signature

Multi-proxy signature is an extension of the basic proxy signature primitive. In a multi-proxy signature scheme, an original signer can delegate his signing rights to a group of proxy signers. And only the cooperation of all the proxy signers can generate the proxy signature on behalf of the original signer. Combining multi-proxy signature with i- dentity-based cryptography, some identity-based multi proxy signature schemes have been proposed. But to date, no for- malized security model has been provided for identity-based multi-proxy signature schemes. This paper gave the formal definition of identity-based multi proxy signature schemes and formalize a notion of security for them.