Safe medium is way and road to process problem. The article explain a process to sending and receiving a letter by digital ID of E-mail, mentions that CA center can assume duty of the safe medium.
安全中介是解决这一问题的方法和途径，本文以电子邮件数字证书为例，讲述发送接收加密信件的过程，说明CA中心可以担当安全中介的重任。
PC as the center of the future digital family in data store and process, it is a critical requirement that exchange data between PC and cell phone, and manage the internal data of the cell phone.
PC作为数字家庭信息存储和数据处理的中心，如何在PC与手机之间进行数据交换，有效地管理手机内部信息资源，已经成为一个迫切的需求。
Active noise control (ANC) is a new high technology integrated with acoustic, adaptive control and digital signal process and it has become the research focus center of noise control.
主动噪声控制是集声学、自适应控制及数字信号处理等技术为一体的高新技术，已成为国内外噪声控制界的研究热点。
Active noise control (ANC) is a new high technology integrated with acoustic, adaptive control and digital signal process and it has become the research focus center of noise control.
主动噪声控制是集声学、自适应控制及数字信号处理等技术为一体的高新技术，已成为国内外噪声控制界的研究热点。
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