基于树结构与门限的思想，王志伟等人提出了一个高效的组密钥协商协议(TTS协议)，并认为他们的协议是安全的。

Based on tree and threshold idea Wang et al. proposed an efficient group key agreement protocol (TTS) and claimed that their protocol is secure.

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王：太好了。从衣橱里拿出一件红色和一件黑色的旗袍志伟，今天晚上我穿哪件好？

Wang: That's great. (Taking out one red and one black woman's cheongsam from the wardrobe) Zhiwei, which one is better for me to wear tonight?

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王强把婴儿丢在爱丽的门口，志伟生气找王强理论，王强为求脱身，竟把志伟给打伤。

Wang Qiang abandons the baby at Ai Li's doorstep. Zhi Wei confronts him and gets beaten up by him.

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