With the developing of the computer ne tw ork and the deversifing of the digital information,it has put for-word new ch allenge to the technology of the information secrecy because the traditional enc ryption method has not met with the requirement.

• 计算机网络的发展和数字信息的多样化对信息保密技术提出了新的要求,人们在已有的加密算法的基础上开始着手研究新的加密方法以满足不同类型数据的保密要求。