Design of Image Block Cipher Based on Hybrid Digital Chaotic System
Jian Kong, Guangming Sun, Yu Zhang, Juan Liu, Yong Liu · 2023
In order to solve the problem of degraded chaotic performance after digitization of chaotic system, a novel random sequence combining multiple chaotic systems was studied in this paper. Based on the sequence, a novel hybrid chaotic image block cipher system was studied, where digital images were encrypted by substitution, local permutation and global permutation. With the advantages of abundant control parameters, large key space and extreme sensitivity to secret keys, the block cipher system possessed strong security, which could well resist a variety of attacks. Besides, the system also had good anti-jamming capability, thus enabling favorable restoration of ciphertext images after damage or partial loss.