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.
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?
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.
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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