Separable ciphertext domain reversible data hiding method

Abstract

The invention relates to a separable ciphertext domain reversible data hiding method, which comprises three parts of a content owner, a secret data hider and a receiver, and is characterized in that the content owner preprocesses a carrier image to vacate a spare space to hide secret data; the secret data hider can directly hide secret data without knowing the content of the carrier image; after the receiver obtains the encrypted image with the secret data, the receiver can extract the secret data and recover the carrier image. According to the invention, a separable ciphertext domain reversible digital hiding method is realized. The authorized user can recover the carrier image in a lossless manner or extract the secret data in a lossless manner according to own needs or own held secret keys.

Description

technical field [0001] The invention belongs to the technical field of information hiding, and in particular relates to a method for reversible data hiding in a separable ciphertext domain. Background technique [0002] Reversible data hiding in the ciphertext domain refers to the technology that the carrier used to embed the secret is encrypted, and the original carrier can still be decrypted without error after the secret is embedded. This technology combines encryption and steganography, and is one of the research hotspots of privacy data protection in the cloud environment. Separable ciphertext domain reversible data hiding emphasizes the separability of the two processes of user extraction of hidden secrets and reversible recovery of carrier data, which has greater significance for user privacy protection and information security and management in cloud environments. [0003] In 2012, Zhang et al. proposed a separable ciphertext image data hiding mechanism, using matri...

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Problems solved by technology

[0003] In 2012, Zhang et al. proposed a separable ciphertext image data hiding mechanism, using matrix operations to compress the LSB of the encrypted image to make room for hidden data, and the receiver can independently perform the extraction of secret data or the extraction of the carrier image. recovery, but the accuracy of the extraction of secret data and the recovery of the carrier image in this scheme is based on the statistical feature of image pixel correlation, so its reversibility cannot be fully guaranteed

To sum up, the key to the separable reversible data hiding method is to ensure the reversibility of the carrier recovery process in the case of directly decrypting the embedded ciphertext, and the embedding of the ciphertext domain data will inevitably modify the encrypted data, and the more the modification Assembly leads to greater decryption distortion

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