Design and Implementation of Color Image Encryption Based on Qubit Rotation About Axis?

摘要

Currently, almost all color image encryp-tion/decryption algorithms are designed based on a clas-sical computer, in which the key space is relatively small, and the huge gains from quantum parallelism are not ob-tained. To address this problem, we propose a novel color image encryption/decryption method based on random ro-tation of qubit and Quantum Fourier transform (QFT). First, the color image is represented in a quantum super-position state |Image〉, in which the color information of each pixel is described by only one qubit |c〉. Then, the |c〉are randomly rotated on the Bloch sphere about three co-ordinate axis, and the QFT is performed on the |Image〉. Once again, the |c〉 is randomly rotated on the Bloch sphere and then the inverse QFT is performed on the |Image〉, which the encryption process is implemented. The keys are the rotation angles of two above-mentioned rotations. The decryption is the inverse process of the encryption. Our method may run on a quantum computer in the fu-ture. The simulation results on the classic computer show that our approaches have better security.