【摘要】 通过简述现代密码体制中的数据加密标准ＤＥＳ和ＲＳＡ公钥体制存在的某些问题，针对目前对上述两种体制研究的人较多，并且各国对自身研究水平实施保密，一般实际水平都要比所公开的超前五到十年或更多，所以很难确定其对上述体制的攻击强度，继而论述了序列密码体制的一般技术原理及其某些优越性，并给出一个基于序列密码体制的微机加密算法．更多还原

【Abstract】 This paper through describing the some problems of standard(DES) and RSA sys- tem of date’s encryption of morden cipher. Against to the people of researching two kinds of system is numerous and each country profecing security to researching horizontal. The horizontal is generally more than five to ten years or more., than the article disserted the stream ciphers commonly theory and the superiority, and getting a microcomputer enctyption algorithm basing on stream ciphers.更多还原