密钥分配协议是数据安全通讯的重要支持，但是一些协议在发生密钥泄露后，即使用新的安全密钥取代，仍有可能遭受再次攻击。
The key distribution protocols are important support for safe data communication, but some of them may be attacked again even adopt new safe key after key betrayed.
第7章介绍寻址、可靠通讯、元数据交换、安全等其它相关高级概念。
Chapter 7 covers advanced concepts related to addressing, reliable messaging, metadata exchange, security, and more.
介绍了现有无线数据通讯技术的实用性、可靠性、安全性，分析了该技术在热网监控系统中应用的可行性。
This paper analyzes the practicability, reliability, and security of wireless data communication technology, and the feasibility of its application in thermal power grid supervisory system.
本文以XWMIS为例，介绍了一个远程MIS的设计和实现，并着重探讨了MIS中远程通讯和数据安全性的实现。
This article introduces a remote MIS's designing and realization. It discusses the realization of remote communication and the data security in the XWMIS.
展台为警卫提供了安全和舒适的环境，与电气连接，空调和取暖，数据和通讯线路，还有橱柜。
The booth provides safety and comfort for the guards, with electrical connections, air conditioning and heating, data and communications lines, and cabinets.
展台为警卫提供了安全和舒适的环境，与电气连接，空调和取暖，数据和通讯线路，还有橱柜。
The booth provides safety and comfort for the guards, with electrical connections, air conditioning and heating, data and communications lines, and cabinets.
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