Hill encryption and dynamic DNA coding based image encryption method

Abstract

The invention discloses a hill encryption and dynamic DNA coding based image encryption method which is used for solving the problem that an existing image encryption algorithm is too complex and is liable to crack. The hill encryption and dynamic DNA coding based image encryption method is characterized in that a hill encryption matrix is constructed to perform replacement encryption on an imageby adopting a method combining a hyperchaotic system with an elliptic curve, so that strong dependency among elements is avoided, and complexity and difficulty in realizing of elliptic curve encryption are avoided, and therefore, the encryption algorithm is simple; a dynamic DNA coding rule is combined, and the coding rule is randomly selected according to different positions of pixels for performing DNA coding on the pixels, so that safety of the encryption algorithm is improved, and dependency among secret keys is reduced, therefore, a ciphertext is difficult to crack; and finally, a hyperchaotic sequence is used for scrambling the image. The hill encryption and dynamic DNA coding based image encryption method improves secret key sensibility, safety of transmitted data, further can effectively resist known plaintext and selected plaintext attack, has relatively good ability of resisting exhaustive attack, statistical attacks and differential attacks.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to an image encryption method based on Hill encryption and dynamic DNA encoding. Background technique [0002] Digital images have the characteristics of intuitive and easy to identify, vivid, high redundancy, large data capacity, etc., and have gradually become one of the commonly used ways of information exchange. Digital images are vulnerable to unauthorized network transmission, and encryption technology must be used to ensure the security of image transmission. Some traditional encryption algorithms such as DES, AES, and RSA do not take into account the strong correlation between pixels of the digital image itself. Therefore, there will be many problems such as low encryption strength or too long encryption time when they are applied to image encryption. Now, more and more methods are applied to image encryption, such as hyperchaos theory and DNA encoding technology....

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problem that the existing image encryption algorithm is too complicated and easy to crack, the present invention proposes an image encryption method based on Hill encryption and dynamic DNA encoding, and uses a method combining hyperchaotic system and elliptic curve to construct a Hill encryption matrix pair The image is replaced and encrypted, which avoids the strong correlation between elements, and also avoids the complexity and difficulty of elliptic curve encryption; then according to the location of the pixel, the encoding rule is randomly selected, and the pixel is encoded with DNA. Finally, use The hyperchaotic sequence scrambles the image; it improves the sensitivity of the key, the security of the transmitted data, and can effectively resist known plaintext and chosen plaintext attacks, and has better resistance to exhaustive attacks, statistical attacks and differential attack

Images