Image encryption method based on chaotic mapping and chaotic S-box substitution

Abstract

The invention provides an image encryption method based on chaotic mapping and chaotic S-box substitution in the technical field of image encryption, and the method comprises the steps: S10, obtaining a color image file, carrying out the Hash calculation, obtaining a Hash value, and calculating a system parameter based on the Hash value; step S20, generating four initial values of four-dimensional hyper-chaotic mapping based on the Hash values, and further obtaining four groups of chaotic pseudo-random sequences; s30, extracting a sequence Wz based on the chaotic pseudo-random sequence and system parameters, and generating a chaotic S box by using the sequence Wz and the S box using the AES algorithm; step S40, performing Arnold scrambling on the color image file to obtain a scrambled image, and performing byte substitution on the scrambled image by using a chaos S box to obtain a substituted image; and S50, performing image diffusion encryption on the three components of the RGB in the substitution image by using the chaos pseudo-random sequence and the system parameters to obtain three pieces of ciphertext data, and obtaining an encrypted image based on each piece of ciphertext data. The method has the advantage that the security of image encryption is greatly improved.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to an image encryption method based on chaotic mapping and chaotic S-box substitution. Background technique [0002] With the development of the Internet and multimedia technology, the spread and influence of digital images continue to expand, and a large number of digital images are transmitted, shared and stored on the Internet every day. How to ensure the security of digital images involving sensitive information such as military, financial, political, and medical information during transmission and storage has always been a hot research topic in information security. The most direct way to protect digital images is to encrypt them. However, since digital images are different from text information and have the characteristics of strong correlation, large data volume, and high redundancy, RSA, Data Standard Encryption (DES), Advanced Encryption Standard (AES), and Interna...

AI Technical Summary

Problems solved by technology

However, because digital images are different from text information and have the characteristics of strong correlation, large data volume, and high redundancy, RSA, Data Standard Encryption (DES), Advanced Encryption Standard (AES), and International Data Encryption Algorithm ( IDEA) and other encryption algorithms are not suitable for the encryption of digital images, which makes digital images have great security risks in the process of transmission and storage.

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