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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We also point out that the scheme presented by Shum and Victor cannot provide strong non-repudiation and strong unforgeability.
并且这个方案能够满足强不可伪造性和强不可否认性。
Finally, we prove its correctness, and prove that our scheme has the strong unforgeability, strong non-repudiation, strong authentication and public confirmatory.
最后，我们同样证明了其正确性，并证明了该方案满足强不可伪造性、强不可否认性、强可识别性和公开验证性。
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.
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。
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