Face image encryption method, decryption method and image processing device

By combining a four-dimensional hyperchaotic system and DNA encoding technology with the hash value of facial images and an external key, efficient encryption of facial images is achieved. This solves the problems of small key space and low security in existing technologies, and realizes highly complex local encryption and improved information entropy.

CN120658372BActive Publication Date: 2025-10-17SHAANXI LOGISTICS GRP IND RES INST CO LTD
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Patent Information

Application Number
CN202511127398.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-08-13
Publication Date
2025-10-17
Estimated Expiration
2045-08-13

AI Technical Summary

Technical Problem

Existing facial image encryption methods suffer from low security due to small key space, high complexity of chaotic systems, and simple scrambling and diffusion methods. DNA encoding technology lacks sufficient randomness in encryption, lacks targeted local encryption, and is weak against changes in lighting and posture.

Method used

A four-dimensional hyperchaotic system is used to generate multiple chaotic sequences. An intermediate key is generated by XORing the SHA-256 hash values ​​of facial images. An initial value is calculated by combining the intermediate key with an external key. The facial images are then subjected to ring-level hierarchical scrambling, bit-plane splicing, V-select scrambling, and dynamic bit-level DNA cross-coding to achieve efficient image encryption.

Benefits of technology

It enhances encryption flexibility and security, increases the key space, increases the difficulty of attacks, significantly improves the information entropy of images, and achieves highly complex local encryption, making it suitable for the secure transmission and storage of facial images.

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Abstract

The application belongs to the technical field of image encryption, and specifically discloses an image encryption method, an image decryption method and an image processing device. Through the application, firstly, a new four-dimensional hyperchaotic system is constructed, and the complexity of the chaotic system is enhanced by introducing a fourth-dimensional state variable; secondly, the Haar cascade classifier of OpenCV is used to realize accurate and rapid detection of facial images, so as to ensure the real-time performance of the encryption process, and a chaotic sequence generated based on a SHA-256 hash value and an external key is used as a key, which is high in calculation efficiency, and the external key expands the key space and increases the difficulty of external attacks; then, the chaotic sequence is used to realize double scrambling strategies of ring layering scrambling, bit plane splicing and V selection scrambling, so as to destroy the pixel space and pixel value correlation and enhance the encryption complexity; finally, the chaotic sequence is used to diffuse pixel values by using dynamic bit-level DNA crossover coding and DNA arithmetic operation, so as to further enhance the encryption complexity.
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