Double image encryption using double pixel scrambling and linear canonical transform

A novel method of double image encryption is proposed, by utilizing random phase encoding in the LCT domain to encrypt two images into one encrypted image with stationary white distribution. By proper application of keys i.e. order of transform and random phase mask. The images can be recovered without any loss of information. The phase based image is more sensitive to keys and disturbances than amplitude based image. The image pixel scrambling operation enhances the quality of the decrypted image when noise occurs and linear canonical transform improves authentication. Numerical simulations have been done to prove the security and validity of the proposed method.