Journal
CHINESE JOURNAL OF ELECTRONICS
Volume 27, Issue 4, Pages 799-807Publisher
TECHNOLOGY EXCHANGE LIMITED HONG KONG
DOI: 10.1049/cje.2017.09.004
Keywords
Color image representing; Color image encrypting; Qubit rotating; Quantum Fourier transform; Quantum image processing
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Funding
- National Nature Science Foundation of China [61170132]
- PetroChina Innovation Foundation [2016D-5007-0302]
- Natural Science Foundation of Heilongjiang Province, China [F2015021]
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Currently, almost all color image encryption/decryption algorithms are designed based on a classical computer, in which the key space is relatively small, and the huge gains from quantum parallelism are not obtained. To address this problem, we propose a novel color image encryption/decryption method based on random rotation of qubit and Quantum Fourier transform (QFT). First, the color image is represented in a quantum superposition state vertical bar Image >, in which the color information of each pixel is described by only one qubit vertical bar c >. Then, the vertical bar c > are randomly rotated on the Bloch sphere about three coordinate axis, and the QFT is performed on the vertical bar Image >. Once again, the vertical bar c > is randomly rotated on the Bloch sphere and then the inverse QFT is performed on the vertical bar 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 future. The simulation results on the classic computer show that our approaches have better security.
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