Color digital image encryption method based on 2D-VMD and eight-dimensional hyperchaotic system
An encryption method and digital image technology, applied in the field of information security, can solve the problems of small key space, poor security, and easy to be cracked.
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[0085] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0086] In this embodiment, the programming tool is Matlab R2013a, and the Pepper color image with a size of 256×256 shown in Figure 2(a) is selected as the plaintext image. The specific process of encrypting the color Pepper image is as follows:
[0087] Key generation phase:
[0088] 1. Input a color Pepper image and denote it as P, separate the red, green, and blue primary color components of the image P to obtain three matrices R, G, and B with a size of 256×256.
[0089] 2. Select the initial value of the eight-dimensional hyperchaotic system: x 1 (0)=-3.523012492378857,x 2 (0) = 2.214736943456894,x 3 (0)=-0.124589756258934, x 4 (0) = 5.254896731454865, x 5 (0) = 4.357864852457864, x 6 (0) = 1.335697855645823, x 7 (0) = 0.457896857877584, x 8 (0) = -3.225589674312357, σ 1 = 0.030000124589637, σ 2 =0.041256390213035. Using the plaintext ...
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