一、引言在信息社会中,无论是经济用途或军事目的,都需要传输和贮存大量数据。为了保证经济上竞争的成功或军事斗争的胜利,对这些数据加以保护是非常必要的。对数据的通信或贮存进行保护就是数据保密。保密的需要由来已久,但以前的保密方法是十分简单的。如用固定的密码本对电报 I. INTRODUCTION In the information society, large quantities of data need to be transmitted and stored for economic or military purposes. In order to guarantee the success of economic competition or the victory of the military struggle, it is necessary to protect these data. Data protection is the protection of data communications or storage. The need for confidentiality has existed for a long time, but the previous method of confidentiality was very simple. Such as using a fixed code book on the telegram