Aiming at the shortages of the internal security in test system, the research on the application of (t, n) threshold scheme of combined participants cheating prevention on test system is taken.
针对目前考试系统存在的内部安全漏洞，展开了防多人联合欺骗门限方案在考试系统中的应用研究。
PKI based security scheme for railway ticket and reservation system is presented, from trust model, management system to security design.
从信任模型、管理体制、安全性设计等方面提出适合于铁路客票系统的基于PKI的安全解决方案。
This thesis also proposes implement strategy and solution scheme of system security problem which every database system can not avoid.
另外，阐述了在任何一个数据库系统中、都不可避免的系统安全性问题的实施策略和解决方案。
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