An Image Encryption Algorithm Based on Chaotic System and Fractional Fourier Transform
An image encryption algorithm based on chaotic system and fractional Fourier transform is proposed.The image encryption process includes the two steps: first the image is encrypted by using confusion matrix which is generated by chaotic system,then the confusion image is encrypted by employing Fractional Fourier domain double random phase,finally the cipher image is obtained.The security of the proposed algorithm depends on the sensitivity to initial conditions of chaotic system,the randomness of phase mask and the orders of FRFT.Theoretical analysis and experimental results demonstrate that the algorithm is favorable.
This is a study on the fractal analysis regarding the chemical degradation of three types of protector films in air polluted with SO2. Fractal analysis is a method used to study surfaces properties of protector film. The films composed of natural resins (shellac, colophony and dammar) and ethanol are exposed on atmosphere with SO2.