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Protection for critical electronic document grouping anti-collusion digital fingerprinting algorithm

Author: LengZhou
Tutor: LiLei
School: Huazhong University of Science and Technology
Course: Computer System Architecture
Keywords: Digital watermarking Digital fingerprint Concatenated code Conspiracy Attack Block design
CLC: TP309.7
Type: Master's thesis
Year: 2011
Downloads: 33
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Abstract


With the development of the Internet , internal network of important electronic documents protection requirements are also increasing, based on the traditional means of information security cryptography can not meet the needs of practical applications . Digital watermarking and digital fingerprinting technology can be personal information and specific behaviors linked to enhanced controllability of information , so examine how these two techniques used within the network to protect important electronic document has important theoretical significance and practical value . Discusses digital watermarking and digital fingerprinting technology to protect important electronic documents the necessity, feasibility and the need to concern based on this research developed the basic objectives and content involved . Illustrates the basic model of digital watermarking , evaluation indicators and attacks against it , while focusing on the digital fingerprinting technology , including fingerprint classification, coding, attacks against fingerprints and fingerprint tracking, tracing fingerprints summarized some of the problems faced by . Based around a BIBD (Balance Incomplete Block Design) block digital fingerprint algorithm design, analysis of orthogonal codes and BIBD code encoding two important advantages and disadvantages . On this basis , the combination of these two coding respective advantages designed based on orthogonal block codes BIBD . Algorithm design fully investigated collusive users within the network characteristics of the users are grouped into a high probability of collusion groups conspire low probability into another group . In addition , the use of concatenated codes encoding , code block based BIBD orthogonal code , the outer code using a widely used error correction code -RS (Reed-Solomon) code . Gives a digital fingerprint algorithm associated with the encoding and decoding algorithm to analyze the performance of the algorithm , including the algorithm's time complexity and space complexity. Code length calculation of the algorithm and two classical coding algorithm are compared . The algorithm in Matlab environment was simulated experiments mainly from the spatial domain and frequency domain two aspects of verification, the main effects of attack and attack and attack randomly selected . Experimental results show that the algorithm is able to track and attack for all conspire users , for random attack in most cases be able to track multiple collusive users, only a few cases traced to one .

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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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