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金融机构目前大多采用同步数字序列(SDH)和异步转移模式(ATM)等数据网络提供固定(虚拟)线路来连接需要通信的部门和分支机构。从内部网络流出的数据不加防范地在网际线路中穿行,给使用搭线窃听、电磁泄露等入侵手段的不法黑客以可趁之机。因此,需要利用网络密码机提供访问控制、无连接完整性、数据源鉴别、载荷机密性和有限流量机密等安全功能,弥补由于TCP/IP协议体系自身带来的安全漏洞。
Financial institutions now mostly use data networks such as synchronous digital hierarchy (SDH) and asynchronous transfer mode (ATM) to provide fixed (virtual) lines to connect departments and branches that need to communicate. Outflow from the internal network of data through the Internet without any precaution through to the use of wiretapping, electromagnetic leakage and other means of invasion of illegal hackers to take advantage of. Therefore, the network cipher machine needs to provide security functions such as access control, connectionless integrity, data source authentication, load confidentiality and limited traffic confidentiality to make up for the security vulnerabilities caused by the TCP / IP protocol system itself.