The paper mainly focus on these two aspects to solve the safety problems of the system, identity recognition and the formation, distribution and delivery of the key code.
文中主要是从身份的识别和密钥生成、分配、传递体系，这两个方面分析和解决系统的安全问题。
The paper mainly focus on these two aspects to solve the safety problems of the system, identity recognition and the formation, distribution and delivery of the key code.
文中主要是从身份的识别和密钥生成、分配、传递体系，这两个方面分析和解决系统的安全问题。
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