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在这个计算机的信息时代,计算机和网络的运用无处不在,在各行各业,都会使用计算机,以提高效率,节省人力。但是随着计算机技术和应用的普及,安全问题随之显现。所以,很多文档有权限限制。比如:一些文档只有相关人员有权查看,一些文档需要付费查看,等等。这时候,加密技术就会成为解决问题的手段。对需要权限的文档进行加密,拥有相应权限的个人,可以从文档的提供方获取秘钥对文档进行解密。只有正确解密的文档才能被正常浏览。本文首先对ndis防火墙技术进行了介绍,分析了ndis技术在文件加密保护中的作用;然后对流过滤技术进行了介绍,并具体讲解了流过滤技术在文件加密保护中的应用以及具体算法和流程;最后,针对TCP/IP报文特点,介绍了校验和算法。
In this information age of computers, the use of computers and networks is ubiquitous. Computers are used in all walks of life to increase efficiency and save manpower. However, with the popularization of computer technology and application, the security problems appear. So, many documents have permission restrictions. For example: some documents only related personnel have the right to view, some documents need to pay to view, and so on. At this time, encryption technology will become a means to solve the problem. To encrypt documents that need permissions, individuals with the appropriate permissions can obtain the key from the document provider to decrypt the document. Only properly decrypted documents can be viewed normally. This paper firstly introduces the ndis firewall technology, analyzes the function of ndis technology in file encryption protection, then introduces the stream filtering technology, and explains the application of stream filtering technology in the file encryption protection and the specific algorithm and flow. Finally, based on the characteristics of TCP / IP packets, the paper introduces the checksum algorithm.