说明：  为了保证数字信号与所传信息的安全，防止无权用户干扰和窃密，一般应采取加密措施。数字信号比起模拟信号来易于加密，且效果也好，这是数字通信突’ 出的优点之一。国内的网间隔离安全设备(如防火墙等)产品较多，但服务器的安全和与之通信的客户的安全更为重要，服务器和客户端的软件应具有信息加解密、身份认证、访问控制、信息完整性和抗否认性验证等内容
(To ensure the digital signal and the transmission of information security, right to the user interference and theft prevention, general measures should be taken to encryption. Than analog signals to digital signals easy encryption, and the results Ye Hao, digital communication is suddenly ' out of one of the advantages. A gateway to isolate the domestic security devices (firewalls, etc.) more products, but the server communicate with the security and safety is more important to customers, the server and client software should have the information encryption and decryption, authentication, access control, information Anti-denial of the integrity and authentication, etc.)