Chaos-Based Optical Single-Channel Multi-color Image Encryption Method
An encryption method and color image technology, which is applied in the field of optical encryption technology and information security, can solve the problems of large space occupation, degraded decrypted image quality, and reduced transmission efficiency, so as to improve security, overcome key distribution and management, The effect of expanding the encryption key space
Inactive Publication Date: 2021-08-13
TIANJIN UNIV
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Problems solved by technology
But the problem is that it takes up a lot of space and reduces the transmission efficiency
In addition, for multi-color image encryption, the current problem is that the crosstalk noise caused by the mutual crosstalk in the process of simultaneous encryption and decryption of multiple color images leads to a serious decline in the quality of the decrypted image during the decryption process of multi-color images
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[0071] In order to overcome the deficiencies in the prior art, the present invention aims at the encryption problem of multi-color images with CMYK four-color channels in the full-color printing process, and proposes a multi-color image based on inverse discrete wavelet transform and Standard chaotic random phase encoding Encryption algorithm, its advantages are: (1) By introducing IDWT operation to convert CMYK color graphics, the proposed cryptosystem can be realized on a single-channel optical path, and can overcome the problems of key distribution and management; (2) propose The scheme directly encrypts the CMYK space image with four channels, avoiding the loss of color information caused by space conversion; (3) By introducing the QR coding technology, it effectively reduces the impact of crosstalk noise on the decrypted image quality on the original basis. (4) This scheme is also suitable for simultaneous encryption of multi-color images, and shows high encryption efficie...
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The present invention belongs to the field of optical encryption and information security. Aiming at the encryption problem of multi-color images with CMYK four-color channels, the present invention, based on a chaotic optical single-channel multi-color image encryption method, the steps are as follows: (1) Encryption: Step 1: The QR code image is decomposed into four color channels of cyan, magenta, yellow, and black; then the four channels are fused by inverse discrete wavelet transform IDWT to obtain a grayscale image to be encrypted; Step 2: Generated by Standard chaotic mapping Chaotic random phase plate CRPM, and then the image to be encrypted is modulated by CRPM; Step 3: The modulated image first undergoes linear canonical transformation LCT, and then performs phase and amplitude operations to obtain the private key and preliminary encryption results; Step 4: Preliminary encryption The result and the private key are further scrambled by Arnold; the decryption process is reversed. The present invention is mainly applied to image encryption occasions.
Description
technical field [0001] The invention belongs to the field of optical encryption technology and information security, and relates to an optical encryption method for single-channel multi-color images in CMYK space based on IDWT and Standard chaotic mapping. Background technique [0002] With the continuous development of image acquisition technology and the continuous improvement of acquisition accuracy, it is not uncommon for criminals to collect printed images through high-precision scanners and print them again to produce counterfeit goods and disrupt market order. In the printing process, the CMYK (cyan-magenta-yellow-black) color space is generally used, but the digital images obtained by the scanner are mostly displayed in the RGB (red-green-blue) color space. The use of two different color spaces in the printing and scanning process will inevitably lead to the conversion of the color space of the image during the printing and scanning process, resulting in the transfer...
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IPC IPC(8): H04N1/44H04N1/56H04L9/00
CPCH04L9/001H04N1/44H04N1/56
Inventor 唐晨申玉馨
Owner TIANJIN UNIV