Image information encryption and decryption method based on improved Arnold transformation and LSB

Abstract

The invention discloses an image information encryption and decryption method based on improved Arnold transformation and LSB. The method includes: using the improved Arnold transformation to preprocess an image, and using an LSB algorithm to embed the preprocessed image into a background image to form a new image with the encrypted image. The encryption process mainly includes: calculating the information quantity which can be contained by the background image, inputting a key, using the improved Arnold transformation to preprocess a hidden-information image, saving the size of the hidden-information image, and using the LSB algorithm to embed the hidden-information image into the background image. The decryption process mainly includes: extracting the size of the hidden-information image, using the LSB algorithm to extract the hidden-information image, inputting a key and performing reverse Arnold transformation on the extracted hidden-information image so as to achieve decryption. By the image information encryption and decryption method, information confidentiality is enhanced greatly.

Description

technical field [0001] The invention relates to the technical field of information hiding, in particular to an image information encryption and decryption method based on improved Arnold transformation and LSB. Background technique [0002] Steganography technique is a technology for image encryption and hiding in the field of information security research. At the same time, it is also a typical solution to the covert channel problem in the field of computer applications. It has a wide range of applications in the military field, information camouflage and other information encrypted transmission fields. [0003] Aiming at the problem of information hiding technology, at this stage, there are mainly two solutions: space-time domain algorithm and transform domain algorithm. However, due to their own inherent shortcomings, the two methods cannot be directly used in the practical application of image information hiding. The main disadvantage of the space-time domain is that t...

AI Technical Summary

Problems solved by technology

However, due to their inherent shortcomings, the two cannot be directly used in the practical application of image information hiding.

The main disadvantage of the space-time domain is that the hidden information is easy to be detected. Although the encryption technology of the transform domain is relatively good, the capacity of information hiding is small, and it is limited by the pixel distribution of the image.

[0004] Although image information hiding technology has been widely studied, there is no perfect solution so far, and the hiding schemes adopted for different application scenarios are also different.

Images