关键词: 数据链，数据安全，DSP, PXI总线接口，加密算法

Abstract: With the development of warfare,information technology has become a key factor to the success of the war. Data link is an important platform on which the information warfare relies. According to the demand of data link, this paper designed a kind of data link terminals for data security module, achieved a relatively independent data encryption and decryption processing on the PXI bus platform, illustrated the designing concept, the function and the basic working process of the module.

Key words: Data link, Data security, DSP, PXI bus interfaces, Encryption arithmetic