目前，人们大量采用基于密码或数字证书的认证系统。
At present, people adopt a large amount of network authentication systems based on password or digital certificate.
针对数字电视有条件接收系统中的密钥分配，提出了一种基于椭圆曲线密码的分层访问控制密钥分配方案。
A key distribution scheme based on elliptic curve cryptography for Conditional Access System (cas) in Digital TV broadcast is proposed.
数字监控系统有安全密码，没有权限的人员将不能对监控系统进行查询，设置系统，删除文件等操作。
Digital monitoring system has password security, there is no authority on personnel will not be able to monitor system information, system Settings, delete files, and other operations.
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