Two Image Encryption Algorithms Based On F-Y Scrambling And Z-Z Scrambling

With the continuous development of computer science and Internet technology,the transmission of multimedia information has experienced explosive growth both in frequency and scale.However,the openness and sharing of cyberspace have made information security issues constantly pushed to the forefront.The rapid development of communication technology and computing speed has changed the way people exchange information.Pictures and videos have gradually surpassed text and audio to become the largest proportion of information ocean.Image information has some characteristics that make some traditional algorithms that are not targeted gradually weak,and image encryption algorithms are more stringent in terms of encryption speed and encryption security.The image encryption method based on chaos theory has certain advantages in both efficiency and security.The purpose of the author is to further explore the field of chaotic image encryption based on the work of many predecessors.Designing more efficient and secure algorithms,breaking away some of the flaws of existing methods,and combining the latest technology to make breakthroughs in information security technology.This paper proposes several new image encryption schemes based on chaos theory.(1)A new chaotic image encryption scheme based on Fisher-Yatess scrambling and DNA coding is proposed.The SHA-3 algorithm is first used to calculate the hash value of the initial cipher,which is used as the initial parameter of the chaotic system.Then use the Fisheryez scrambling algorithm combined with the chaotic sequence to extract the most explicit image for the first scramble and use sort sorting for further scrambling to ensure the effect.Next,using DNA coding methods and chaotic sequences for DNA-level diffusion,this makes ciphertext information more random and improves the ability to combat some attacks(such as statistical analysis).Finally,part of the information in the plaintext is brought into the encryption system for pixel level diffusion.The experimental results and security analysis show that the algorithm has excellent encryption efficiency and good encryption effect,and can resist common attacks.(2)An image encryption algorithm based on improved ZigZag transform and LL complex chaotic system is proposed.By combining two different chaotic systems,a more complex LL hybrid chaotic map with better chaotic characteristics,wider parameter range and moderate computational efficiency is constructed.The scrambling process uses the improved ZigZag transformation method in combination with the Lu system to perform sub-channel segmentation scrambling on the original text.The LL encryption system combined with the Lu system and Logistic mapping provides a safe and efficient key stream for the diffusion process.The experimental results and security analysis show that the algorithm has excellent encryption efficiency and good encryption effect,and can resist common attacks.