Space-frequency-based multichannel dual encryption for quantum color images using chaotic system and quantum walks

In the HSI color space, image data can be processed separately for intensity and color information, aligning with human visual perception. While previous research has predominantly focused on the intensity channel, this research introduces a novel approach to quantum color image encryption using a space-frequency-based multichannel dual encryption scheme, employing chaotic systems and quantum walk techniques. This paper leverages double random-phase coding technology and the quantum Fourier transform within the hue and saturation channels, providing a more comprehensive solution when compared to the QIRHSI encryption scheme, which solely encrypts the intensity channel. Consequently, this approach offers a fresh perspective on quantum image encryption. Furthermore, a quantum circuit is designed for diffusion processing in the intensity channel, incorporating cross-swap, XOR, and XNOR operations, with key sequences derived from quantum walks and chaotic sequences produced by a 2D-SCLMS chaotic system. Simulation and performance analysis demonstrate that the proposed encryption method exhibits lower computational complexity and larger key space compared with other algorithms. This design effectively fortifies the system against potential attacks, ultimately enhancing the overall encryption performance.