Multiple images encryption and authentication using cascaded phase encoding with random sparse constraint

Abstract

In this paper, multiple-image encryption and authentication is proposed using cascaded phase encoding (CPE) with random sparse constraints. Instead of sparsely sampling the retrieved ciphertexts, every original image is encoded into two sparse phase-only masks directly using CPE with random sparse constraints in the encryption process of this scheme. Two ciphertexts and random sparse constraints are required for decryption and authentication, which enlarges the key space and enhances the security simultaneously. Additionally, the amount of data from the retrieved phase only masks for every image in a very small way, so this scheme can encode more images and the encryption capacity is enlarged greatly. Various simulation results are shown to demonstrate the feasibility and security of this proposal.

Asymmetric multiple-image cryptosystem based on LUP decomposition in spherical diffraction domain

“…One is the multiplexing cryptosystem [35][36][37][38], which has proved to suffer from cross-talk disturbance and limits to the capacity of encryption. The other is the cascaded cryptosystem [39], in which images are encrypted in sequence. Since an asymmetric cryptosystem using phase-truncation (PT) in the FT domain has been proposed [40,41], many multiple-image cryptosystems use non-linear operations to improve security as well, such as PT [42,43] and interference [44].…”