Dual paths cryptosystem based on tilt Fresnel diffraction using non-spherical mirror and phase modulation in expanded fractional Fourier transform domain

Hang Chen (1, 2) , Zhengjun Liu (3) , Camel Tanougast (4) , Feifei Liu (1) , Walter Blondel (2)

1 Jiangxi University of Science and Technology
2 CRAN - Centre de Recherche en Automatique de Nancy
3 HIT - Harbin Institute of Technology
4 LCOMS - Laboratoire de Conception, Optimisation et Modélisation des Systèmes

In this paper, a dual optics paths optical image cryptosystem based on tilt Fresnel diffraction and a phase modulation in extend fractional Fourier transform (eFrFT) domain is presented. The tilt Fresnel is designed by using a non-spherical mirror. A part of data from the original image is modulated by the mirror, while the other part is encoded by an expanded fractional Fourier transform. Besides, the random data of the dual channels is combined for forming the encrypted image. The structure parameters in designing the optical hardware system and the random phase can be regarded as decryption keys. Various potential attack experiments are implemented to check the validity of the proposed cryptographic system.

Mots clés: Optics and photonics; Physics

Domaines: Traitement du signal et de l'image [eess.SP]; Imagerie; Optique / photonique

Hang Chen, Zhengjun Liu, Camel Tanougast, Feifei Liu, Walter Blondel. Dual paths cryptosystem based on tilt Fresnel diffraction using non-spherical mirror and phase modulation in expanded fractional Fourier transform domain. Scientific Reports, 2019, 9, pp.15071. ⟨10.1038/s41598-019-50263-4⟩. ⟨hal-02403593⟩