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分析了HLL方案的错误,证明了通过适当选择代理签名者Pi的身份参数(ID)能够弥补HLL方案的缺陷,并且不会增加签名过程的计算复杂性.使得改进后的HLL方案是一个安全、实用的门限代理签名方案.
The error of the HLL scheme is analyzed and it is proved that the HLL scheme can compensate for the defect of the HLL scheme by appropriately selecting the identity parameter (ID) of the proxy signer without increasing the computational complexity of the signature process. The improved HLL scheme is a secure, Practical Threshold Proxy Signature Scheme.