Grayscale image encryption method based on local negative integer base transformation hybrid chaos mechanism

• Main Authors: WU SHUFA, XIONG GANGQIANG, DONG WENJIAO, TAN QIANWEI, YU HAIBING, YANG ZIHUA, KIM SEULYE, SUN JIANBO, LING YAO, ZHANG ZHIYI, CAO RUDAI, WANG SHIHONG
• Format: Patent
• Language: Chinese; English
• Published: 17.10.2023
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention discloses a gray level image encryption method based on a local negative integer base transformation hybrid chaos mechanism, and the method comprises the steps: constructing a plurality of P-Box and a plurality of S-Box through local negative integer base transformation and chaos mapping, and randomly selecting different P-Box and S-Box for each row and each column, thereby achieving the replacement and scrambling operation of pixel values. The constructed S-Box not only depends on an external key and a plaintext image, but also depends on LNBT, the replacement process is dynamic and random, the constructed P-Box not only depends on the external key and the plaintext image, but also depends on LNBT, and the scrambling process is dynamic and random. Besides, the selection of the P-Box and the S-Box of each column and each row also depends on the plaintext image, the external key and the LNBT, so that the scrambling operation and the replacement operation are dynamic, and the security of image enc