题目内容
Since anybody in the world can access the system through the internet, the security aspect will have to be strictly dealt with.
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If the system is going to be a standalone one, it is doubtful whether the system will truly be able to achieve this functionality.
Hardware requirements we must use for a stand-alone system are usually higher than a web-based system because all the features should be included into the system when we implement it.
1919年，德国人亚瑟.谢尔比乌斯发明了转轮机, 这就是历史上最著名的德国“_____”密码机
1949年_____撰写的奠基性论文“保密系统的通信理论”在《贝尔系统技术杂志》上发布，首次将信息论引入密码技术的研究。
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