Color two-dimensional bar code encryption and decryption method in high-dimensional chaotic system

Abstract

The invention provides a color two-dimensional bar code encryption and decryption method in a high-dimensional chaotic system. According to the method, application methods of a DNA sequence and an SHA-256 algorithm in the high-dimensional chaotic system are defined, and the DNA sequence and the SHA-256 algorithm are applied to encryption and decryption of a color two-dimensional bar code. An encryption method relates to steps such as generating a key and an initial value; carrying out coding through utilization of DNA; carrying out exclusive or operation on color two-dimensional bar code and key matrixes; carrying out color two-dimensional bar code matrix value substitution; carrying out decoding through utilization of the DNA; and synthesizing the encrypted color two-dimensional bar code. A decryption method is reverse operation for the encryption method. From a simulation experiment, it is observed that the method provided by the invention has relatively high pseudo-randomness, forgery prevention and attack resistance.

Description

technical field [0001] The invention belongs to the application field of computer image processing and information security technology, and in particular relates to a color two-dimensional code encryption and decryption method under a high-dimensional chaotic system. Background technique [0002] As digital media, color QR code is a commonly used form in network applications. It has the advantages of beautiful and practical, large amount of stored information and strong fault tolerance. weak. Since the current classical encryption methods are no longer suitable for the encryption and decryption requirements of color two-dimensional codes, the research on color two-dimensional code encryption and decryption methods has become a research hotspot in the academic circle. [0003] Adleman proposed the DNA molecular coding and computing method, DNA coding and computing methods have been widely used in image encryption, identity verification, digital signature and other related fi...

AI Technical Summary

Problems solved by technology

Since the above methods are all based on low-dimensional chaotic maps, the anti-attack ability of encrypted images is weak

In order to solve the above problems, some scholars have proposed a method of using SHA-256 to generate the initial value of a one-dimensional chaotic system and using multiple iterations of Brownian motion to scramble to realize image encryption, but the time complexity of this method varies with the scrambling and diffusion of pixel values. The number of iterations has increased significantly

Then an image steganographic encryption method based on the Lorenz system is proposed, but this method is not ideal in terms of the recovery quality of the encrypted image.

Process the color QR code in layers to improve the security of the color QR code by increasing the channel and data capacity of each color. This method will lead to unsatisfactory encryption efficiency due to the single processing method

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