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近十多年来,国外对密码学的研究相当活跃,发展很快。原因是:(1)、由于计算机科学的发展,将威胁着一些较弱的密码机的使用;(2)、数据通信网的发展,电信事业的进步,人们对通信、数据的传输和存取提出了新的要求;(3)、一些发达的资本主义国家关于“计算机犯罪”已成为一个严重的问题。因此,通信和数据的保密问题,除了军事、外交部门外,也引起了例如银行、商业等部门的关注;(4)、1975年美国国家标准局颁布了数据加密标准(DES)和1976年迪菲和赫尔曼提出公开密钥密码学以
In the past ten years or so, foreign researches on cryptography have been quite active and developed rapidly. The reasons are: (1) due to the development of computer science, the use of some weaker ciphers will be threatened; (2) the development of data communications networks, the advancement of telecommunications, the transmission and access of people to communications and data Put forward new requirements; and (3) the issue of “computer crime” in some developed capitalist countries has become a serious problem. Therefore, the secrecy of communications and data, in addition to the military and diplomatic departments, also aroused the concern of departments such as banking and commerce. (4) In 1975, the National Bureau of Standards of the United States issued the Data Encryption Standard (DES) and the 1976 Di Philippine and Herman proposed open-key cryptography