A digital image encryption method

Abstract

The invention discloses a digital image encryption method. The digital image encryption method can be widely applied in engineering design, and the application of a Bezier method in image processing is a practical operation. The modification method is based on a digital image encryption algorithm of a rational quadratic Bezier curve. The system retains the simple form of a one-dimensional chaoticsystem. Since three weight factors and an initial x value are used as the initial values, all key spaces are large. In addition, the encryption and decryption of the system are low in complexity and high in efficiency. By simulation tests, the gray histogram of an image encrypted by the algorithm is relatively uniform, the correlation strength and the like between adjacent pixels in the encryptedimage are significantly lower than those of the conventional encryption algorithm, and a good encryption effect is achieved.

Description

technical field [0001] The invention relates to the field of computers, in particular to a method for encrypting digital images by using computers. Background technique [0002] Due to the popularity of network applications, users use the Internet to transmit images more and more frequently. According to incomplete statistics, about 70% of the information disseminated in the network is reflected in the form of digital images. Therefore, the problem of safe transmission of digital images appears more prominent. At present, the main means to protect the security of image transmission is to encrypt the image. [0003] Traditional image encryption technologies such as DES, IDEA, RSA, etc., although the encryption key space is large, it is difficult to be cracked, but these encryption algorithms are proposed based on the characteristics of text encryption. When encrypting an image, the correlation between adjacent pixel values At the same time, the image loses its original appe...

AI Technical Summary

Problems solved by technology

Traditional low-dimensional systems (especially one-dimensional chaotic systems) have the advantages of simple form and low computational time overhead, but due to their small key space and low sequence complexity, the security of cryptographic systems is not high

However, high-dimensional chaotic systems, especially hyper-chaotic systems, generally have more than 4 initial variables, so the key space is larger, and complex encryption algorithms and transformation processes are mainly used to obtain more efficient encryption indicators, but at the same time it brings High complexity, slow encryption and decryption speed, less efficient than one-dimensional system

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