Cryptanalysis of a double-image symmetric optical cryptosystem utilizing devil’s vortex Fresnel array and the linear canonical transform
Hukum Singh
Abstract
This cryptosystem employs a symmetric double-image encryption technique based on the Devil’s Vortex Fresnel Array (DVFA) and the Linear Canonical Transform (LCT). Images are individually encrypted using Double Random Phase Encoding (DRPE). A DVFA combines a devil’s cantor zone plate, a Vortex Array, and a Fresnel zone plate phase mask. This scheme aims to enhance authenticity by increasing the number of keys through the utilization of multiple parameters in the DVFA. Additionally, these masks possess the ability to store multiple keys within a single mask, adding extra security parameters. DVFAs are also essential for generating spiraling waves that carry orbital angular momentum (OAM) and have various applications, including cryptography, quantum computing, bio-photonics, astronomy, and the development of vortex lenses or phase mask systems. The sensitivity to encryption keys, including the LCT orders has also been analysed. In addition, the performance of the scheme has also been assessed through various evaluation metrics.