This paper briefly reviewed Morales-Rocha et al. 's scheme, gave a new scheme with solutions to these flaws. After analyzing the performance and contrasting with their scheme, this paper made a conclusion that the new scheme solves the flaws above and has better performance.%简要回顾Morales-Rocha等人的方案,针对这些缺陷提出相应的解决方案.经过性能分析并与原方案对比后,得出结论:改进方案解决了以上缺陷,从而具有优于原方案的性能.
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