With the widespread use of information and network technologies, information Security has become study focus.
随着信息和网络技术的广泛应用，信息安全己成为研究的热点问题。
Technologies of cryptography are the core of information security.
密码技术是信息安全的核心技术。
Technologies of cryptography, especially encryption technologies are the core of information security.
密码技术，特别是加密技术是信息安全技术的核心。
Research on the Theories and Key Technologies of Information System Security Evaluation;
信息安全风险评估是考察信息系统安全性的一个重要环节。
Research on the Theories and Key Technologies of Information System Security Evaluation;
信息安全风险评估是考察信息系统安全性的一个重要环节。
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