一种基于新超混沌Chen系统的置乱替代相结合的加密算法

随着多元化媒介和数字化信息网络的急速发展,数码形象加密技术在图形形象的安全保存、传达输送、著作权保护和秘密通信等领域被普遍推广应用。针对现有基于超级混沌的图像加密算法的缺点,提出了一种改进算法,该算法对像素加扰进行优化配置,通过像素置换和加密文本扩散过程,进一步混乱明文图像与加密文本图像的关联效应,从而能缩短超级混沌系统的迭代时间。研究结果表明加密后直方图的像素值分布均匀;密文之间的NPCR值和UACI值分别为99.6521%和33.4321%,表明算法对加密密钥的微小改变具有极强的敏感性;在新超混沌序列量化模式中引入该方法可有效提高操作效率,且该算法无论在安全方面还是有效运用方面都具备良好性能,可在图像安全通信和其他领域广泛使用。

Encryption algorithm based on scrambling substitution of new hyperchaotic Chen system

With the rapid development of diversified media and digital information network,the digital image encryption technology is widely used in the fields of secure preservation,communication,copyright protection and secret communication of graphic images.In view of the shortcomings of the existing image encryption algorithm based on hyperchaos,an improved algorithm is proposed,which optimizes the configuration of pixel scrambling,and further confuses the correlation effect between the plaintext image and the encrypted text image through pixel replacement and encrypted text diffusion process,thereby shortening the iteration time of the superchaotic system.The results show that the distribution of pixel values in the histogram after encryption is very uniform;the NPCR value and UACI value between ciphertexts are 99.6521%and 33.4321%,respectively,indicating that the algorithm is extremely sensitive to small changes in encryption keys.The introduction of this method in the new hyperchaotic sequence quantization mode can effectively improve the operation efficiency,and the algorithm has good performance in both security and effective application,and can be widely used in image security communication and other fields.