中文摘要：

网格技术的发展使得各教学机构之间形成一种松散耦合形式的虚拟教学环境来共享各种教学资源。针对教学资源共享存在的安全问题，提出在教育资源共享系统中部署多级代理授权认证策略，实现各虚拟教学机构之间资源请求的身份代理认证，用户通过单点登录来共享虚拟教学环境中的所有教学资源。研究和实例表明由于每个用户都通过合法的证书访问系统，较好地解决了系统中的安全性、可靠性、真实性、匿名性、防重传和不可否认性等安全问题。

英文摘要：

With the development of grid technology, independent education enterprise with similar goals, forming loosely coupled virtual environment for collaboration and resource sharing. The construction of virtual teaching environment is hampered because of the .security, however. In this paper, proposed multi - degree proxy authentication strategy to achieve identity proxy authentication of resource request, which is to share all teaching resource of virtual teaching environment after user＇s single - sign - on. The research result shows that this method can resolve many security problems such as reliability, authenticity, anonymity, re-send, and non- repudiation.