Quantum-assisted encryption for digital audio signals

A novel quantum encryption method for audio signals is proposed. We introduce a novel quantum representation model for audio. The encryption principle is based on two secret random-phase encoding operations performed in both the input and quantum Fourier transform (QFT) planes of the proposed quantum representation model for audio respectively. Due to the reversibility of the quantum computation, the decryption process is the inverse of the encryption process. Simulation results and theoretical analyses show that the proposed approach offers a significant gain in terms of robustness, computational complexity and advantages over its classical counterparts. It opens the way for introducing audio encryption into quantum scenarios.