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1·In view of the present insecurity factors in computer network, this paper analyzes data disaster recovery technology, puts forward an effective data backup and disaster recovery solution of OA system.

针对目前计算机网络中的不安全因素，研究在电力系统中利用灾难恢复技术，为保证OA系统数据安全可靠而采取的措施，提出OA系统的数据备份及灾难恢复方案。

2·Because of the network open and other insecurity factors, we often want to transmit data, image and video information by effective encryption.

由于网络的公开性以及其他不安全因素，我们往往希望能够将我们要传送的数据，图像以及视频等信息进行有效的加密传输。