基于文件过滤驱动的文本数字水印研究与实现

电子文档易于编辑，存储和传输，在提高办公效率的同时也具有数据安全隐患。为了对文件实施加解密保护，防止加密文件被泄露，提出了一种基于文件过滤驱动和数字水印的文件保护方案。首先研究了Minifilter技术的在内核层的加解密原理并使用这项技术开发出微过滤驱动程序。通过对文件I/O请求进行拦截，添加保护功能，对文件数据实施加密保护。接着，结合高级加密标准（AES）算法和海明码编码技术，使用Minifilter技术对无格式文本中的数据进行水印信息的嵌入。最后，实现了基于文件过滤驱动的文本数字水印系统，通过测试表明这个系统可以加强文件数据的安全性，为文本数据提供了更全面的保护，提出的文本水印算法在保证足够水印容量的前提下具有良好的不可见性和鲁棒性。

Research and Implement of Text Digital Watermark Based on File Filter Driver

Electronic documents are easy to edit, store and transmit, in improving the efficiency of the Office and also has a data security risk. For encryption and decryption of file protection prevents encrypted file was leaked, is presented in this paper are based on file system filter driver file protection and digital watermarking scheme. Minifilter technology are first studied in principle of encryption and decryption of the inner nuclear layer and use the technology to develop the micro-filter driver. Through the blocking of file I/O requests, added protection functions for cryptographic protection of file data. Then, combine the Advanced Encryption Standard (AES) algorithm and the Hamming code, use minifilter technology of unformatted text watermark information embedded in the data. Finally, the implementation of a text digital watermarking system based on file system filter driver, testing shows that this system can enhance the security of file data, for text data to provide a more comprehensive protection, Watermarking algorithm is proposed on the premise of ensuring sufficient capacity has a good invisible and robustness.