Research On Quantum Image Encryption Method Jointed Pixel With Chroma

With the emphasis on information security,the research of image encryption technology is very necessary.The combination of quantum theory and image encryption has become the new darling,and the idea has also provided infinite possibilities for image processing.The content of this paper is based on quantum information theory,and quantum image processing technology is introduced into image encryption.The the main contributions and innovations of this thesis are demonstrated as follows:1.NE-QSNC(A Novel-Sets of Quantum Image of n Coordinates)quantum representation of a image is proposed,which can effectively reduce the demand for storage resources.The basic geometric operations and color operations based on the quantum image are defined,and the storage of the quantum image is realized.For the first time,1 q-bit is used to express the position information of pixel,and gray number bits are used to represent chromaticity information.The algorithms of storing,geometric operation and color operation of the quantum image and the corresponding quantum circuit are designed.2.An encryption method based on controlled position and controlled-XOR operation for NE-QSNC quantum images is established.This method applies characteristics of chaotic mapping sensitive to initial values to NE-QSNC quantum image encryption,significantly improves the security of quantum image encryption.Only when the initial value is known can the accurate ciphertext image be obtained,and the key is slightly biased and can not be decrypted properly.3.A FRQI(A Flexible Representation of Quantum Images)quantum encryption scheme based on Logistic chaotic mapping and random phase joint operation is proposed.The method uses the sequence generated by the Logistic chaotic map to encrypt the location information of the quantum image,and simultaneously uses the random phase to encrypt the color information of the quantum image,thus remarkably improving the security of the quantum image encryption.Compared with the quantum gray level image encryption scheme based on controlled transformation,the proposed method significantly reduces the computational complexity.