基于DES及其改进算法的文件加密系统

随着信息技术的飞速发展,信息安全问题已成为当今社会所面临的重要问题。数据加密标准（DES）因其较高的安全性而被广泛应用于各个行业领域,但是深入的研究证明该算法存在诸多不足。文中在已有的DES算法及其改正算法的基础上,提出了一种新的方法。该方法综合利用了三重DES算法与独立子密钥算法的优点,把原来的64位密钥扩展为128位,通过双重加密增强了加密强度,同时采用局部密钥独立的特性提升加密强度和效率。基于所提出的加密技术,设计并实现了一个加密系统,针对.word、.pdf、.mp3等格式的文件进行了测试,结果证明该系统可行且有效。

Encrypted File System Based on DES Algorithm and Its Improved Algorithm

With the rapid development of information technology,information security has become an important problem in current socie-ty. Data Encryption Standard （ DES） which has high security has been widely used in various fields. However,many in-depth researches have shown that this algorithm has many deficiencies. Based on the previous DES algorithms,propose an improved method,which com-bines the advantages of the triple DES algorithm and the separate sub-key algorithm. In the new strategy,the original 64-bit key is ex-panded to 128 bits,it enhances the encryption strength by the process of double encryption,and also improves the security and efficiency through adopting the independent sub-key. According to the method,design an encrypted file system,then test its performance by the files of . word,. pdf,. mp3 and other formats,and the results show that the system is feasible and effective.