当今社会是信息化的社会。为了适应社会对计算机数据安全保密越来越高的要求，美国国家标准局(NBS)于1997年公布了一个由IBM公司研制的一种加密算法，并且确定为非机要部门使用的数据加密标准，简称DES(Data Encrypton Standard)。自公布之日起，DES算法作为国际上商用保密通信和计算机通信的最常用算法，一直活跃在国际保密通信的舞台上，扮演了十分突出的角色。现将DES算法简单介绍一下，并给出实现DES算法的VC源代码。

DES算法由加密、解密和子密钥的生成三部分组成。-society today is the information society. In order to adapt to society for computer data security and confidentiality of the increasingly high demand the National Bureau of Standards (NBS), released in 1997 by an IBM developed an encryption algorithm, identified departments use non-confidential data encryption standard short DES (Data Encrypton Standard). Since the date of publication, DES algorithm as an international business confidential communications and computer communications of the most commonly used algorithm, international has been active in the confidential communications on the stage to play a very prominent role. DES algorithm will now give a brief account, and gives DES algorithm to achieve the VC source. DES algorithm by encryption, decryption keys and sub-generated three co