Research On Image Encryption Algorithm Based On Rubik's Cube Theory

Since the 21 st century,the exploration of computer networks has entered a new era.Digital information has been widely used in various fields and has been linked to people's daily life and work in recent years.At the same time,illegal information theft and tampering,destruction during use,computer virus and cyber hacking's disruptive actions in the process of using pose serious threats to the transmission and reception of information.The security of image information transmission is also receiving much attention as the main carrier of information.Therefore,this article focuses on the research of digital image encryption.Traditional digital image encryption methods,such as DES algorithm,IDEA algorithm,and RES algorithm have serious deficiency,which ignore the features of image information with large capacity and high redundancy.Information encryption technology based on chaotic systems can resist repeatedly attacks by attackers.But the small key space limits its development.The security of such an algorithm needs to be further improved.Therefore,this paper designs a digital image encryption algorithm base on Rubik's cube theory.The main work includes the following aspects:(1)According to the current digital image encryption technology,there is a shortcoming that the key space is small and it easy to be attacked.I propose a theory that the digital image is encrypted based on the Rubik's cube theory.The original image pixels can be effectively scrambled.The problem of small key space in encryption technology has been improved by theoretical calculation.The feasibility of this theory has been verified by MATLAB.This theory can resist the attacks of various illegal intruders and improve the security of image information transmission.(2)The next step improved the encryption technology of the original Rubik's Cube theory.The Rubik's Cube encryption system obtains an encrypted data stream by iteratively performed in encryption process.Then the encrypted data stream XOR with the scrambled original image.This theory solved the problem of small keys space and can withstand the attackers' unlimited attacks.Then I made the encrypted image embedded into another image by digital watermarking technology,which improved the hiding characteristics of the secret image.(3)The grim problem that famous paintings and calligraphies are fraud at present is valued.This chapter proposed an idea of protection of famous paintings and calligraphies.Taking color images as an example,firstly,I isolate from color image to three basic colors.Then each basic color is carried out two layers by two-dimensional discrete wavelet decomposition technology.Finally,I encrypt its low-frequency components.The algorithms of encryption and decryption are proposed in this chapter are simple and easy to implement.Finally,I summarize the full text and point out the shortcomings of this theory and further research directions in this thesis.