而是否具有形式化的可证安全性，是衡量密码体制是否安全的最重要的标准。
While, the most important principle in evaluating a cryptosystem is whether it can be proved to be secure formally.
结论：术前充分准备，严格掌握手术适应证，熟练掌握手术操作技能，可提高老年人腹腔镜胆囊切除的安全性。
Conclusions: Under carefully preparation before operation, strict indication and skillful operation, safety of laparoscopic cholecystectomy can be greatly improved in the aged patients.
安全性分析表明，在假设CDH问题是难解的情况下，该方案在随机预言模型中是可证安全的。
The performance analysis results show that the scheme is provably secure in the random oracle model under the CDH problem assumption.
安全性分析表明，在假设CDH问题是难解的情况下，该方案在随机预言模型中是可证安全的。
The performance analysis results show that the scheme is provably secure in the random oracle model under the CDH problem assumption.
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