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中文摘要：
当前,代理签名是信息技术研究的热点。但是,多数的研究集中在理论与分析方面,应用研究较少,对门限代理签名的应用研究则更少。利用基于双线性对和椭圆曲线上的离散对数难题的门限代理签名技术,我们提出了在线答辩系统。该系统的显著特点在于：每一次答辩,答辩专家都需要经过主服务器的授权,这就使得其不能否认自己所提交的答辩意见。在该系统下,由于采用了门限化的处理方法,只要同意答辩通过的答辩专家人数达到了要求,学生就可以通过答辩。
英文摘要：
Nowadays, the proxy signature is one of the research hotspots of information technology. However, most researches focus on the theory and related analysis rather than its applications, especially the application of threshold proxy signature schemes. Based on a threshold proxy signature scheme with bilinear-pairings and the difficulty of discrete logarithm on ellipse curves, an online thesis oral defense system is proposed. It main feature is that for every oral defense, experts have to be authorized by the main sever, which means oral defense experts can＇t deny having submitted their own opinion. Only the number of experts that approve the thesis reaches the requested amount, does the student pass the oral defense.
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