Double color image encryption method based on DNA sequence operation and deformed coupled map lattices

Abstract

The invention discloses a double color image encryption method based on DNA sequence operation and deformed coupled map lattices. The method comprises: utilizing a secret key and two color plaintext images to generate parameters and initial values of iterating the deformed coupled map lattices, and generating secret key streams of L1, L2, K1 and K2 and random numbers of d1, d2 and d3 through iteration; separating red, green and blue trichromatic components of the plaintext images, transforming the components into binary matrices, and recombining the six binary matrices to obtain recombination matrices of A and B, utilizing the secret key streams of L1 and L2 to carry out bit-level scrambling on the matrices of A and B, and dividing the same into six binary matrices; utilizing a DNA encoding rule and combining the random numbers of d1, d2 and d3 to transform the binary matrices into DNA matrices, and executing DNA addition, subtraction and exclusive OR operations; and utilizing a DNA decoding rule to transform the DNA matrix into decimal matrices, utilizing the secret key streams of K1 and K2 and the bitwise exclusive OR operation to change values of image pixels, and obtaining ciphertext images of C1 and C2. The method can encrypt the two plaintext images at the same time, and has the advantages of high security, good encryption effect, no information loss, fast encryption speed and the like.

Description

technical field [0001] The invention belongs to the technical field of information security, and in particular relates to an encryption method of a double-color image based on DNA sequence operation and deformed coupling image lattice, and realizes digital encryption for two color images by using DNA encoding technology, bit-level transformation and space-time chaos. Background technique [0002] Digital images are popular because of their unique features such as intuition, image, and rich information. People save a large number of digital images on disks and spread them on the Internet, followed by illegal copying, forgery, tampering, and illegal access and other image security issues have become increasingly prominent. Therefore, how to protect the security of digital images has become an important research topic in the field of information security. On the other hand, due to the characteristics of large data volume and strong correlation between adjacent pixels in digita...

AI Technical Summary

Problems solved by technology

Multiple color images contain more information than a single grayscale image, and the data format and representation are more complex

Therefore, the encryption method for a single grayscale image cannot be directly extended to the encryption of multiple color images.

In addition, these algorithms also have problems such as weak security, perception degradation, and information loss.

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