为网络视频会议传输提供有效的通信安全，采用一个会议密钥分配的智能卡系统，来解决使用者身份认证和通信安全问题。
It presents smart card system of session key distribution for communications safety to net video conference transmission, resolves user identity authentication with security.
如何建立以及确定使用者的身份，是为“身份认证”所需负责的工作；而讨论“访问控制”，则必须假设使用者已经过认证的过程而得到正确的身份。
How to set up and ascertain users 'status is what authentication does, while Access Control must assume the users have gone through authentication and obtained their proper status.
公钥基础设施PKI向信息使用者和提供者提供了认证功能，但在通过身份认证后，用户可以做什么，或说授权领域，则没有进一步涉及。
PKI has supplied the authentication feature for the information user and holder, but what can user do after the authentication, in this area PKI can't support.
公钥基础设施PKI向信息使用者和提供者提供了认证功能，但在通过身份认证后，用户可以做什么，或说授权领域，则没有进一步涉及。
PKI has supplied the authentication feature for the information user and holder, but what can user do after the authentication, in this area PKI can't support.
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