本文根据多媒体信息的特点和多媒体认证的具体要求，提出了一种新的数字图象可恢复性主动签名方法（RADS）。
This paper presents a novel recoverable active signature technique of digital images(RADS) , according to the characteristics of image contents and the requirements of multimedia authentication.
该方案具有：身份认证、可变密钥、抗主动和被动攻击的优点。
It has features as follows: identity authentication, changeable communication key, secure against active and passive attack.
文章讨论了主动网络节点的授权和认证，以及实现中必须解决的技术问题。
This paper discusses authorization and authentication of active node in active networks, and issues about their implementation.
为了保障主动网络安全，我们需要两个基本服务，即认证和授权。
In order to secure active networks, we need two basic services: authentication and authorization.
为了保障主动网络安全，我们需要两个基本服务，即认证和授权。
In order to secure active networks, we need two basic services: authentication and authorization.
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