A new optical encryption system for image transformation

作者：Yao, Shuyu; Chen, Linfei^*; Chang, Guojun; He, Bingyu

来源：Optics and Laser Technology, 2017, 97: 234-241.

DOI：10.1016/j.optlastec.2017.07.005

• Optical image encryption
• Fresnel diffraction
• Phase retrieval algorithm
• Double image cross pixel scrambling approach

This paper introduces a new optical image encryption system based on Fresnel diffraction and phase iterative algorithm, which can realize the conversion between different images. The method is based on the optical system of free space transmission, and uses the iterative phase retrieval algorithm to encode an image into two phase masks and a ciphertext. Unlike the existed methods, the ciphertext is a visible image, which can be used to achieve the conversion of one image to another image. In order to enhance the security, two phase masks are combined into a wide-scale phase mask by the double image cross pixel scrambling approach. In the decryption process, the wide-scale phase mask is re-decrypted into two random phase masks using a random shift matrix. The ciphertext and the first phase mask are placed on the input plane and the second random phase mask is placed on the transformation plane. The Fresnel diffraction principle can be used to obtain the plaintext information on the output plane. Theoretical analysis and simulation results show that the encryption system is feasible and quite safe.

• 出版日期2017-12-1
• 单位杭州电子科技大学