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.　(C)　2015　Elsevier　GmbH.　All　rights　reserved.