Image encryption based on composite hyper chaotic system and relevanted with plaintext
Wei Xiao-pengb · Jisuanji yingyong yanjiu · 2011
In order to improve the attack-resistance's ability and security of encryption,this paper discussed the method for image encryption,and presented an improved method.By combining Clifford hyper chaotic system and Logistic chaotic system,got a better Cli-Log chaotic system,and it could be used for disturbing pixels' location.Then inserted parameters into Chua chaotic system via Runge-Kutta method,got chaotic sequences,and used the sequences to do XOR operation with image pixels.Finally realized encryption.This method not only generated a good random sequence,but also increased the key spaces.Most importantly,the inserted parameters that used for scrambling were from the chaotic sequence,so it achieved the cipher text feedback.The computer simulation proves that the method is feasible and effective in encryption,overcomes the shortcoming that lots of encryption algorithms just only related with chaotic system and keys but not with plaintext,and improves the security of encryption.