DES和LFSR混合加密的研究与FPGA实现

Research on Mixed Encryption of DES and LFSR and FPGA Implementation

摘要: 随着网络信息交流量日益增长，信息安全问题成了网络资源应用的发展瓶颈。本文针对计算机与网络上文件的安全性问题，对DES算法以及LFSR密码生成算法进行研究，设计了基于DES和线性反馈移位寄存器(LFSR)的混合加密算法并通过FPGA实现，FPGA根据用户输入的密码组合，通过线性反馈移位寄存器产生一串密钥，然后通过USB将这串密钥发送至计算机中。上位机软件实现与下位机的USB通讯、用DES算法对任意文件进行加密和解密的功能。结果表明，该方案对任意文件加密效果好、速度较快，对于网络空间文件保护有较好的效果。

Abstract: With the growing of network information, the issue of information security has become the bot-tleneck of the development of network source application. This paper aimed at file’s security in the computer and Internet, and researched on DES encryption algorithm and the algorithm of LFSR. Based on above algorithms, we designed a mixed encrypted method realized by FPGA; according to the password combination that is inputted by the user, a bunch of keys will be produced by LFSR and sent to computer by USB. The function of software on the computer is communicating with USB chip and encrypting files with DES algorithm. The results showed that this scheme has good effect and high processing speed on encrypting any certain files, and has a good effect for protecting files on network space.