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Study on Digital Image Encryption and Information Hiding Algorithm Based on Chaos

Author: ChenZhiJian
Tutor: DengShaoJiang
School: Chongqing University
Course: Applied Computer Technology
Keywords: ★ Information Hiding Image Encryption Chaotic Mapping Discrete Wavelet Transform Discrete Cosine Transform
CLC: TP309.7
Type: Master's thesis
Year: 2011
Downloads: 73
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Abstract


With the rapid development of computer communication technology and Internet technology , multimedia information has been widely used . Because of this , information security issues highlighted , in particular the more important issue of digital copyright protection . The chaotic cryptography effective multimedia security technology . First , the multimedia information is different from the ordinary text data , data volume , and a high redundancy , to be encrypted using a conventional encryption algorithm consumes a lot of time and computing resources . Secondly, the conventional encryption theory is only to protect the encrypted digital products , it is difficult to effectively protect the copyright of digital products . Information hiding is a let illegals find digital media files to hide secret information technology can effectively solve the above problem . In this thesis, how to use the chaotic technical analysis and design of digital image encryption and information hiding algorithm research work are as follows : ① introduces the research background information encryption and information hiding , status and application areas , elaborated the concept of information hiding and digital watermarking and the characteristics of the requirements of the robust watermark . And introduces the concept of chaotic systems , characteristics and applications in digital image processing . ② combination of chaos theory and third-order matrix proposed digital image encryption algorithm based on three-dimensional chaotic systems , effective combination of three-dimensional chaotic system and a new diffusion scrambling scrambling iterative image encryption mode (DPP) , the image set the spread of chaos and image combine image encryption . Simulation experiments demonstrate the performance of the algorithm , shows the advantages of three-dimensional chaotic system in the digital image encryption . ( 3 ) focus on the three-dimensional chaotic system mapping based on a robust digital image watermarking algorithm based on DWT and DCT , the algorithm is based on the size of the watermark image block is embedded watermark , ensure invisibility premise maximize enhanced the robustness of the algorithm . Comparative analysis of experimentally verified algorithm practical significance . Finally, the article summarized and pointed out that the innovation and inadequacies in the algorithm , and the need for further study of the problem .

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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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