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The Research on the Relational Database Zero-Watermarking Algorithm Based on Text Attributes

Author: GuoZhiHua
Tutor: MengYingJie
School: Lanzhou University
Course: Computer Software and Theory
Keywords: Relational database Zero watermark Character attributes Feature words Synonyms Partial order relation
CLC: TP309.7
Type: Master's thesis
Year: 2011
Downloads: 39
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Abstract


With the growing popularity of Internet applications , the establishment of e-commerce , e-government and other management information system based on database technology has been more and more through the Internet to provide public services , and how to prevent the proliferation of unauthorized database content become one of the core problems of database data security research . More effective technical means to solve this problem is the use of digital watermarking technology , the basis of analysis of the existing database digital watermarking algorithm based on this , most of the character attribute data items are used to store text information database a characteristics , design a database for data entry of character attributes zero watermarking mechanism , and a more in-depth study of the mechanism , the work and achievements made ??in the following aspects . (1 ) on the basis of the study and comparison of existing databases watermarking scheme , construct a zero- watermarking scheme based on the the characters attribute data entry database , the program two processes by the structure of the zero-watermarking and a zero - watermark detection . ( 2 ) design a based character attribute zero watermark tectonic process . The process generally contain the characteristics of the high-frequency word for the character attribute data items , the introduction of the text characteristic word extraction technology, the extraction of the characteristic words of the value of the character attributes , the same characteristics of the extracted different recording words merged in order to ultimately obtain a feature word collection of word collection of feature words formed their word frequency sort after by encryption coding sequence of zero watermark . Then select the number and proportion of watermark extraction between zero watermark tectonic feature words and how they are constructed watermark through the analysis of simulation experiments , the experimental results show that the zero - watermarking algorithm has better availability . ( 3 ) design based zero - watermark certificate watermark detection process , the process as a prerequisite for the existence of a zero- watermark certification authority , with synonyms decision process to eliminate the impact of the synonym tampered lead watermark feature words based on partial order relationship copyright attribution of relative matching calculation to arrive at the contents of the database . In addition , through theory and simulation analysis of the robustness of the detection algorithm and false positives , show that the zero- watermark algorithm has higher validity .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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