Digital color image encoding and decoding using a novel chaotic random generator
Digital color image encoding and decoding using a novel chaotic random generator
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DOI：
10.1016/j.chaos.2005.11.057
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发表时间：
2007-05
影响因子：
7.8
通讯作者：
H. Nien;Chuan-Kuei Huang;S. Changchien;H. Shieh;C. T. Chen;Y. Y. Tuan-Y.
中科院分区：
文献类型：
--
作者：
H. Nien;Chuan-Kuei Huang;S. Changchien;H. Shieh;C. T. Chen;Y. Y. Tuan-Y.
为了实现彩色数字图像的安全传输，提出了一种新的混沌系统。由于混沌系统的动力学响应对系统的初始值和参数的变化高度敏感，且混沌轨迹不可预测，我们采用变量元素作为加密密钥，并将其应用于数字彩色图像的计算机网络通信中。因此，我们获得了更高的通信安全性。采用相关系数γ统计方法和FIPSPUB 140-1测试连续时间混沌系统变量的可分辨元素分布，并据此选择最佳的加密密钥用于彩色数字图像的保密通信。在发送端，对数字彩色图像进行RGB级分解，并采用混沌密钥加密，最后通过计算机网络传输。在接收端使用相同的加密密钥来解密和恢复原始图像。即使加密图像在公共信道中被盗，由于缺乏足够的加密密钥，入侵者也无法解密和恢复原始图像。实验结果表明，将混沌系统和密钥应用于彩色数字图像的加密、传输、解密和恢复中，可以获得更高的通信安全性和最佳的图像恢复效果。
This paper proposes a novel chaotic system, in which variables are treated as encryption keys in order to achieve secure transmission of digital color images. Since the dynamic response of chaotic system is highly sensitive to the initial values of a system and to the variation of a parameter, and chaotic trajectory is so unpredictable, we use elements of variables as encryption keys and apply these to computer internet communication of digital color images. As a result, we obtain much higher communication security. We adopt one statistic method involving correlation coefficient γ and FIPS PUB 140-1 to test on the distribution of distinguished elements of variables for continuous-time chaotic system, and accordingly select optimal encryption keys to use in secure communication of digital color images. At the transmitter end, we conduct RGB level decomposition on digital color images, and encrypt them with chaotic keys, and finally transmit them through computer internet. The same encryption keys are used to decrypt and recover the original images at the receiver end. Even if the encrypted images are stolen in the public channel, an intruder is not able to decrypt and recover the original images because of the lack of adequate encryption keys. Empirical example shows that the chaotic system and encryption keys applied in the encryption, transmission, decryption, and recovery of digital color images can achieve higher communication security and best recovered images.