Physical Unclonable Functions using speckle patterns of perfect optical vortices

TL;DR

This paper introduces a novel optical PUF based on speckle patterns of perfect optical vortices, providing a physically unclonable and robust security key for optical encryption, validated through experiments and simulations.

Contribution

It is the first to utilize scattered perfect optical vortex beams for PUF-based key generation in optical encryption systems.

Findings

The proposed PUF generates secure, unclonable keys.

Experimental validation shows robustness against crypt-analysis.

Effective alternative to digital keys in optical encryption.

Abstract

Encryption techniques demonstrate a great deal of security when implemented in an optical system (such as holography) due to the inherent physical properties of light and the precision it demands. However, such systems have shown to be vulnerable during digital implementations under various crypt-analysis attacks. One of the primary reasons for this is the predictable nature of the security keys (i.e., simulated random keys) used in the encryption process. To alleviate, in this work, we are presenting a Physically Unclonable Functions (PUFs) for producing a robust security key for digital encryption systems. To note, a correlation function of the scattered perfect optical vortex (POV) beams is utilized to generate the encryption keys. To the best of our knowledge, this is the first report on properly utilizing the scattered POV in optical encryption system. To validate the generated key, one of the standard optical encryption systems i.e., Double Random Phase Encoding, is opted. Experimental and simulation results validate that the proposed key generation method is an effective alternative to the digital keys.