Lastly, under the DDH assumption, the detailed security proof of NLWZ protocol is presented.

最后，在DDH假设下，给出了改进协议(NL WZ协议)的安全性证明。

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The encryption algorithm in the scheme is semantically secure against adaptive chosen cipher-text attacks based on the DDH assumption.

此外，证明了方案中加密算法在DDH假设和适应性选择密文攻击下是安全的。

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