Asymmetric double-image encryption and decryption method based on chaos and cascade DFrRT

• Main Authors: SUI LIANSHENG, LIU QINGWEN, LIU BENQING, LU HAIWEI
• Format: Patent
• Language: Chinese; English
• Published: 17.09.2014
• Subjects: CALCULATING; COMPUTING; COUNTING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS

The invention discloses an asymmetric double-image encryption method based on chaos and cascade DFrRT. The encryption method comprises the steps that two original gray level images are normalized and connected into an extension image in the horizontal direction; next, the extension image is scrambled by i times of cat mapping, and then the extension image is decomposed into two new images; two phase masks are generated through the image f'1, and the image f'2 and one phase mask are subjected to convolution; Logistic mapping is conducted on an obtained complex matrix, and a conversion result is obtained through DFrRT conversion with the order of alpha; the amplitude of the complex matrix is extracted, and the amplitude and the other phase mask are subjected to convolution; Logistic mapping is conducted on an obtained second complex matrix, and a conversion result is obtained through DFrRT conversion with the order of beta; the amplitude of the second complex matrix is extracted, and then a final ciphertext ima