The Study On The Quantum State Sharing And Quantum Image Content Security Technology

Information hiding theory is different from cryptography, which is aninterdisciplinary subject. Information hiding is mainly to study how a secret messagehidden in another public information, and then to pass a secret message through apublic information transmission. The illegal interception is difficult to find the secretinformation from the public information. With the improvement of computingcapability, especially the quantum parallel algorithm presented in citation [1,2], thesecurity of the classical information hiding theory has received the stern challenge. Inthis context, Lots of scholars turn to quantum information hiding. Quantuminformation hiding theory has great application prospect in the field of computer andcommunication etc. The capability and robustness are two important characteristics ofinformation hiding. An ideal information hiding protocol not only can hide a lot ofsecret message, but also can ensure the safety of the secret message. Quantuminformation hiding is the extension of classical information hiding in a quantumcomputer.This article is mainly from the quantum secret sharing and quantum data hidingto study quantum information hiding protocols, the main research contents details areas follows:(1)We propose an effective quantum secret sharing schemes based on five partycluster states in cavity QED. The implementation of this scheme does not involve thejoint-state measurement of multi-atoms, which makes it convenient in a practicalapplication.(2)We investigate the quantum image encryption and decryption algorithm basedon quantum image geometric transformations proposed by Zhou et al[3], and point outsome errors of the presented algorithm. Finally, we give a perfect quantum imageencryption and decryption algorithm.(3)We propose a novel gray-level image encryption/decryption scheme, which isbased on quantum Fourier transform (QFT) and double random phase encoding(DRPE) technique. This is the first time that the double random-phase encodingtechnique is generalized to quantum scenarios. We use two phase coding operationsas the keys for image encryption. Only applying the correct keys, the original imagecan be renewed successfully. Because all the normal operations in quantum computer are reversible, decryption is the reverse order of encryption. A detailed theoreticalanalysis is given to clarify its robustness, computation complexity and advantagesover its classical counterparts.(4)We propose a new color image watermarking strategy based on quantumdiscrete cosine transform (QDCT). Firstly, we present a flexible quantum expressionfor color image, FQRCI. Then we construct the quantum circuits for watermarkembedding and extracting. We give a assessment method of hiding quality, i.e.,evaluating the similarity of the quantum watermarked color image with the originalversion, and that of the extracted quantum watermark image with its original one.Classical simulation experimental results show that the scheme has very strong visualeffect.