1、河南科技大学本科毕业设计（论文） I 分组密码算法 DES 的加密和解密的实现 摘 要 随着信息社会的到来，人们在享受信息资源所带来的巨大的利益的同时，也面临着信息安全的严峻考验。信息安全已经成为世界性的现实问题，信息安全问题已威胁到国家的政治、经济、军事、文化、意识形态等领域，同时，信息安全问题也是人们能否护自己的个人隐私的关键。信息安全是社会稳定安全的必要前提条件。 本文是一篇讨论关于常用文件加密解密算法的毕业设计论文，它详细的讲述了文件加密解密算法实现的过程中所用到的方法、技术。 关键词 ：解密，文件加密，密码体制， DES 河南科技大学本科毕业设计（论文） II 英文摘要 ABSTRA
2、CT With the advent of the information society, people in the enjoyment of information resources brought about tremendous benefits, but also faced with a letter Income security, a severe test. Information security has become a worldwide reality, information security has been a threat to the countrys
3、political .Governance, economic, military, cultural, ideological and other areas at the same time, the issue of information security is also a possibility of retaining their own personal Privacy key. Information security and social stability is a necessary precondition for security. This article is a discussion paper on encryption and decryption algorithms commonly used in graduate design thesis, which documents in detail about the encryption and decryption process of algorithm used in the methods and techniques. Key words: Decryption， file encryption， cryptosystem， DES
