A dual graph encryption method based on fraction rank Fourier conversion
A technology of fractional Fourier and encryption method, which is applied in the field of information security, and can solve the problems of undiscussed secret map performance, difficult optical realization, mutual interference of decrypted maps, etc.
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[0092] The present invention will be further described below in conjunction with the drawings and embodiments.
[0093] Select the standard test gray-scale image "Lena" and the binary image "text" with a size of 256×256 as the original images f(x, y) and g(x, y) to be encrypted in this embodiment, as shown in Figure 4 -1 and Figure 4-2. Use Matlab 2006a for simulation.
[0094] First, normalize their pixel values. After scrambling the binary image, pure phase encoding is performed, and then a composite image is generated with the gray image to perform bi-phase encoding. The transformation order of two two-dimensional fractional Fourier transform is a x =a y = 0.82 and b x = B y = 0.45. The amplitude of the result of double-picture encryption using the present invention is shown in Figure 4-3.
[0095] The following is an explanation and performance analysis of the embodiments in conjunction with the drawings:
[0096] The histogram of the real part of the dense map is shown in Fig...
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