Asymmetric Image Encryption Using Gyrator Transform with Singular Value Decomposition

摘要

Motivated by the endurance of phase truncated asymmetric optical cryp-tosystems against basic attacks, single-channel encryption technique for a color image is proposed, that uses singular value decomposition, and affine transform in gyrator domain. Color 8 images have been used to validate the scheme. The input color image is split into its indexed components-RGB (red, green and blue). The red component of the input image is used as plaintext, and the other two components are used as phase in the encryption scheme. Experimental results presented in the paper are based on computation on MATLAB. The results show that the scheme endures occlusion and noise attacks. The simulation also confirmed the scheme's sensitivity to the encryption parameters of affine transform and gyrator transform. The overall results show that the proposed encryption scheme exhibits high levels of security.