Research And Implementation Of Text Digital Watermark Based On File Filter Driver

Electronic documents have the characteristics of being easy to edit and store and transfer.As part of corporate assets,many secret documents will be stored in the form of electronic documents on the computer disk.Electronic documents improve office efficiency,but in the process of using electronic documents,data leakage risks are gradually exposed.Important document data leaks not only bring serious economic losses,but also have a negative social impact.This thesis proposes a file protection scheme based on file filter driver technology and digital watermarking technology.Using file filtering driver technology to implement encryption and decryption of file data.Embedding watermark information in file data to prevent the intellectual property dispute arising from the encrypted file from being decrypted by the attacker,or the plaintext data is disclosed by the internal staff initiatively.Firstly,the thesis deeply studies the working principle of Minifilter technology,and uses Minifilter to develop kernel filter driver.Through intercepting the file I/O request and adding protection function,it implements the file data encryption protection.Important files are stored on disk in encrypted form,even if the data is illegally stolen,the attacker can only get encrypted garbage data.Then,the thesis analyzes the advantages and disadvantages of the commonly used text digital watermarking algorithm,and realizes the text digital watermarking algorithm based on the font color in the formatted text.The algorithm can embed watermark information of 8bit in one character.Making full use of Minifilter technology embedded watermark in the kernel layer to make up for the lack of robustness based on the font color algorithm.And the thesis uses Minifilter technology to embed the watermark information in unformatted text,which provides a solution for watermark embedding in unformatted text.Finally,the thesis designs and implements a text digital watermarking system based on file filter drive.The feasibility and practicability of the proposed file protection scheme are verified by experiments.Experimental results show that the text digital watermarking system based on file filter drive can enhance the security of the file data,provide more comprehensive protection for the text data,and all aspects of performance can achieve the desiredgoal.