Ciphertext domain reversible information hiding method based on image secret sharing

Abstract

The invention discloses a ciphertext domain reversible information hiding method based on image secret sharing, and the method comprises the steps: encrypting an original image, so as to obtain a ciphertext image; embedding two layers of secret information through polynomial redundancy and the homomorphic property of secret sharing, so that a secret image is obtained; acquiring a second key corresponding to second-layer secret information; directly extracting second-layer secret information from the second secret-carrying ciphertext image through a second secret key; collecting a plurality of different second secret-carrying ciphertext images; recovering the secret by using a Lagrange interpolation polynomial, and then performing homomorphic decryption on the second secret-carrying ciphertext image; and after homomorphic decryption, recovering the original image and extracting the first-layer secret information by adopting a first secret key corresponding to the first-layer secret information and a third secret key corresponding to the ciphertext image. According to the method, the fault tolerance and the disaster resistance of the image with the secret ciphertext are enhanced, the embedding capacity of the reversible information hiding algorithm of the ciphertext domain is improved, and the safety of the carrier image and the secret information is ensured.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method for reversible information hiding in ciphertext domain based on image secret sharing. Background technique [0002] As an important branch of information hiding technology, reversible data hiding in encrypted domain (RDH-ED) can embed secret information in ciphertext data and restore the original carrier without loss. The organic fusion of ciphertext domain information processing technology and information hiding technology realizes the dual functions of information encryption protection and secret information transmission, and provides methods for military, medical and other fields that require carrier security and ensure carrier-free recovery. [0003] Existing ciphertext domain reversible information hiding techniques are mainly divided into three categories: ciphertext domain embedding schemes based on post-encryption generation redundancy, pre-encryption generation r...

AI Technical Summary

Problems solved by technology

However, the current combination of image secret sharing and information hiding is not yet close, and digital watermarks are mainly used to verify the correctness and integrity of shadow images.

[0006] To sum up, the existing RDH-ED algorithm mainly uses the redundancy of the carrier image to reversibly embed the secret information, and the embedding is restricted by the original carrier

At the same time, when the encrypted ciphertext is attacked or damaged, it is impossible to accurately extract the embedded information and restore the original image losslessly

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