Cryptosystem based on devil’s vortex Fresnel array and Fresnel transform for optical double-image encryption
摘要
The Devil’s Vortex Fresnel Array (DVFA) phase mask has garnered significant attention in the field of information processing due to its unique characteristics, such as processing an infinite number of orthogonal modes. The proposed double-image encryption technique is based on the DVFA and the Fresnel Transform (FrT). Multiple images are encrypted using Double Random Phase Encoding (DRPE) technique. A DVFA is created by combining a devil’s cantor zone plate, a vortex array (VA), and a Fresnel zone plate (FZP). This scheme aims to enhance authenticity by lengthening the number of keys through the use of multiple parameters in the DVFA. Additionally, these phase masks can store multiple keys within a single mask, thereby enhancing security through additional parameters. DVFAs are also significant in generating spiraling waves that carry orbital angular momentum (OAM), enabling a wide range of applications. In addition, the strength of the scheme has been evaluated using various metrics and analyses, including FrT orders, MSE-, PSNR-, SSIM-, entropy-, correlation analysis-, key-sensitivity analysis-, key space examination-, cropped attack-, contamination noise attacks-, linear attack-, and histogram analysis. The proposed technique offers enhanced security due to the use of various parameters and demonstrates resistance to multiple type of attacks.