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Image Encryption Based on the Orbit Ergodicity of Chaotic Systems

Author: ChenYongHong
Tutor: YeRuiSong
School: Shantou University
Course: Applied Mathematics
Keywords: Arnold transformation Baker transformation Chaotic system Image Scrambling Image Encryption
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 32
Quote: 0
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Abstract


With the rapid development of network technology , information systems are widely used, more information is spread through the network . Digital image as one of the important information media , with a large amount of data , there is a strong correlation characteristics between the pixels , traditional encryption algorithms such as the famous DES, AES and RSA encryption algorithm is not suitable for real-time digital image encryption requirements , and thus become a hot research and design new image information encryption algorithm , in recent years , the digital image encryption based on chaotic system caused widespread concern . Chaotic dynamical system with initial sensitivity , pseudo- randomness and ergodicity characteristics , this close contact with the structure of the cryptography , chaotic dynamical system is widely used to encrypt and hide information . The main work of this paper is as follows : (1 ) in the two - dimensional Arnold transformation extended to three-dimensional form based on orbit chaotic ergodicity Arnold transform image pixel location and chaotic orbits similar point corresponding track number corresponds to the transformation of the position , to achieve the purpose of the image pixel position scrambling . Scrambling for space use mapping chaotic nature of the coupled map lattice (CML) generate chaos Series , after the gray value bitwise XOR diffusion . Simulation results show that the algorithm 's key space , the degree of scrambling encryption effect . ( 2 ) by introducing the parameters , thereby improving the baker transformation and prove its chaotic characteristics . Based on improved baker transformation , proposed a new image scrambling method , combined with the design image encryption scheme based on wavelet transform image linear fusion method . Simulation results show that good safety performance of the encryption algorithm , compared with the image scrambling algorithm based on discrete baker transform .

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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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