其中对代理签名性质提出更高要求：（1）强不可伪造性（Strong unforgeability）：只有指定的代理签名者能够创建有效的代理签名，原始签名者和没 有被指定为代理签名者的第三方都不能生成有效的代理签名。
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并且这个方案能够满足强不可伪造性和强不可否认性。
We also point out that the scheme presented by Shum and Victor cannot provide strong non-repudiation and strong unforgeability.
指出他们的方案不满足强不可伪造性、强不可否认性和强识别性。
In this paper, the authors demonstrate Chan-Wei scheme does not satisfy strong unforgeablity, strong nonrepudiation and strong identifiability.
强不可伪造性和对安全信道依赖性的分析是对LKK代理签名方案安全性分析的重要内容之一。
The analysis of the property of the strong unforgeability and the necessity of a secure channel is one of the important content for the security analysis of the LKK proxy signature scheme.
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