A superposition based multiple-image encryption using Fresnel-Domain high dimension chaotic phase encoding

A new superposition based multiple-image encryption using Fresnel-domain high dimension chaotic phase encoding is proposed. In this method, each color image of an authenticated user is decomposed into R, G, and B channels. The amplitude of each channel is independently normalized, phase encoded and then modulated by corresponding high-dimension chaotic random phase mask (HDCPM). The modulated R, G, and B channels of multiple color images are individually added and Fresnel transformed to produce corresponding encrypted channels. All the parameters (initial values and control parameters) of HDCPM are exploited as remarkably sensitive decryption keys of the proposed system. Moreover, the update, management, and transmission of the decryption keys are convenient. The individual decryption keys of R, G, and B channels significantly increase the resistance to various types of attacks. The proposed cryptosystem can be executed by using a hybrid optoelectronic system. Numerical simulation results demonstrate the viability and effectiveness of the proposed scheme.