Image Cryptography Technique based on FFT

The author of this article makes studies and discussion on the image cryptography of transforming domains. In the image cryptographic algorithm, the sine chaotic mapping scrambling is applied to the original image and the scrambling matrix is generated by Logistic chaotic system. Fractional Fourier transform (FFT), respectively, is along the x-axis and y-axis that generates a function which is transformed random in the phase mask. The function of the phase mask uses the Logistic chaotic system. The simulation experiments verifies that this algorithm can effectively resist plaintext attack, differential attack and statistical analysis, and the large key space can be achieved to 1087, and has a higher security.