A Parallel Hybrid Chaotic System in Accuracy-Limited Mode

Abstract

The invention provides a parallel hybrid chaotic system in a precision limited mode. The system adopts a PL-LM subsystem, a PL-PWLCM first subsystem and a PL-PWLCM second subsystem which are connectedin parallel, wherein the limited precision of the PL-LM subsystem, the PL-PWLCM first subsystem and the PL-PWLCM second subsystem is 32-bit. The PL-LM subsystem is used, x0 is input into an X chaoticfunction, xn is obtained after n rounds of iteration. The PL-PWLCM first subsystem is used, p1 and y0 are respectively input into a Y chaotic function, and yn is obtained after n rounds of iteration.The PL-PWLCM second subsystem is used, p2 and z0 are respectively input into a Z chaotic function, zn is obtained after n rounds of iteration. Through the exclusive-OR subsystem, xn and yn are subjected to exclusive-OR processing to obtain an exclusive-OR result. Modulo processing is conducted on the exclusive-OR result and zn through the modulo subsystem, a modulo result ri is output, and finally the modulo result ri serves as a pseudo-random sequence to be output through the pseudo-random sequence output end. According to the invention, the secret key space is increased, the quality of thegenerated pseudo-random sequence is improved, and the operation speed is improved.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to a parallel hybrid chaotic system in a precision-limited mode. Background technique [0002] With the rapid development of multimedia services, more and more videos and pictures are generated on the network. Compared with text, pictures and videos contain richer information and are more prone to privacy leakage. Therefore, there have been more and more researches on image encryption in recent years. There is a strong correlation between adjacent pixels of an image, so traditional encryption algorithms such as RSA, DES, and AES are not suitable for image encryption. In recent years, more and more image encryption algorithms based on chaos theory have been proposed. Chaotic systems have many properties suitable for image encryption, such as initial value sensitivity, unpredictability and ergodicity. [0003] Permutation-Diffusion Network (PDN) is widely used in image en...

AI Technical Summary

Problems solved by technology

The precision of the chaotic function in practical application is not infinite, and the limited precision will bring two important problems: 1. The quality of the pseudo-random sequence generated by the chaotic system is reduced; 2. Limiting the key space of the chaotic system

Although both problems can be solved when the accuracy is high enough, it is often at the expense of speed

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