A novel approach to multi-image quantum encryption/decryption using qudits

TL;DR

This paper presents innovative quantum encryption techniques for multi-image color data using qudits, enhancing security and storage efficiency through generalized scrambling and diffusion methods.

Contribution

It introduces new quantum encryption schemes for multi-image data with qudits, expanding the parameter space and security features compared to existing methods.

Findings

Reduced storage space for quantum image representation

Enhanced security through generalized quantum baker map

Flexible schemes for different user needs

Abstract

We introduce groundbreaking techniques in image encryption, assuming the existence of quantum computing ressources functioning with qudits, where d is a power of 2. Our quantum representation of color multi-image is based on space-filling curves and allows to reduce the storage space. We generalize the quantum baker map, so that it may scramble two n-qudits. By doing so, we enlarge its parameter space exponentially, leading to a better security. We define two new concepts of mixed scrambling and mixed diffusion, and present a variety of schemes, depending on the needs of the users.