Chebyshev映射混沌序列用于图像保密通信

Image Secure Communication Using Chebyshev-Map Chaotic Sequences

1引言 混沌是一种复杂的非线性动力学系统[1],混沌现象是非线性确定性系统中的一种类似随机的过程,由于对初值条件非常敏感,以及混沌序列具有类似噪声的宽频谱特性,近年来混沌用于保密通信成为人们关注的研究热点.特别是进入90年代,美国的Pecora和CaHoll[2,3]提出了关于混沌系统的自同步理论,使得这一课题的研究达到了高潮.

In this paper.two image secure communication schemes based on chebyshev-map chaotic sequences are proposed. The synchronization carrier signals can be retrieved directly from received signals in the first scheme,and the good correlation property of chaotic sequences is employed to realize secure communication in the second scheme. The results obtained by computer simulation indicate that the transmitted source image can be correctly and reliably recovered using each proposed scheme even under the situations of a noisy channel. In addition,the schemes proposed in this paper possess higher security and can be implemented easily. At last, the quality of recovered image is discussed through calculating bit-error rate, and the approximate relationship formula is also obtained respectively.