Separable Reversible Data Hiding in Encrypted Images Based on Two-Dimensional Histogram Modification

An efficient method of completely separable reversible data hiding in encrypted images is proposed. The cover image is first partitioned into nonoverlapping blocks and specific encryption is applied to obtain the encrypted image. Then, image difference in the encrypted domain can be calculated based on the homomorphic property of the cryptosystem. The data hider, who does not know the original image content, may reversibly embed secret data into image difference based on two-dimensional difference histogram modification. Data extraction is completely separable from image decryption; that is, data extraction can be done either in the encrypted domain or in the decrypted domain, so that it can be applied to different application scenarios. In addition, data extraction and image recovery are free of any error. Experimental results demonstrate the feasibility and efficiency of the proposed scheme

Reversible Data Hiding in Encrypted Images Using MSBs Integration and Histogram Modification

This paper presents a reversible data hiding in encrypted image that employs based notions of the RDH in plain-image schemes including histogram modification and prediction-error computation. In the proposed method, original image may be encrypted by desire encryption algorithm. Most significant bit (MSB) of encrypted pixels are integrated to vacate room for embedding data bits. Integrated ones will be more resistant against failure of reconstruction if they are modified for embedding data bits. At the recipient, we employ chess-board predictor for lossless reconstruction of the original image by the aim of prediction-error analysis. Comparing to existent RDHEI algorithms, not only we propose a separable method to extract data bits, but also content-owner may attain a perfect reconstruction of the original image without having data hider key. Experimental results confirm that the proposed algorithm outperforms state of the art ones

A Survey on Reversible Image Data Hiding Using the Hierarchical Block Embedding Technique

The use of graphics for data concealment has significantly advanced the fields of secure communication and identity verification. Reversible data hiding (RDH) involves hiding data within host media, such as images, while allowing for the recovery of the original cover. Various RDH approaches have been developed, including difference expansion, interpolation techniques, prediction, and histogram modification. However, these methods were primarily applied to plain photos. This study introduces a novel reversible image transformation technique called Block Hierarchical Substitution (BHS). BHS enhances the quality of encrypted images and enables lossless restoration of the secret image with a low Peak Signal-to-Noise Ratio (PSNR). The cover image is divided into non-overlapping blocks, and the pixel values within each block are encrypted using the modulo function. This ensures that the linear prediction difference in the block remains consistent before and after encryption, enabling independent data extraction without picture decryption. In order to address the challenges associated with secure multimedia data processing, such as data encryption during transmission and storage, this survey investigates the specific issues related to reversible data hiding in encrypted images (RDHEI). Our proposed solution aims to enhance security (low Mean Squared Error) and improve the PSNR value by applying the method to encrypted images

A Review on Separable Reversible Data Hiding in Encrypted Image

This work proposes a new system for separable reversible data hiding in color images encrypted with the approach of adding the matrix. In the proposed scheme, Take color image input and provide the encryption key to encrypt the picture image and then compressed encrypted with various algorithms. Due to the compression of the image to create a sparse space to accommodate the additional data, integrated data using the key data hiding. If the receiver has the encryption key, you can decrypt the received data to obtain the image only. If the receiver has the data hiding key, it can extract data only. If the receiver is both the key to hidden data and the encryption key, it can extract the additional data and recover the original content without any errors using the spatial correlation in the natural image if the amount of data extra is great

An Enhanced Reversible Data Hiding Technique for Coloured Images

To maintain image contents confidentiality and to recover original image, there is a need of Reversible Data Hiding scheme. This paper proposes an enhanced reversible data hiding technique for the coloured image. All previous methods embed data by reversibly vacating room from the encrypted images, which may be subject to some errors on data extraction or image restoration. The proposed method embeds data by reserving room before encryption with a traditional RDH algorithm. It is easy for the data hider to reversibly embed data in the encrypted image. This paper also concerns with a method that embeds the data invisibly into an image. The transmission and exchange of image also needs a high security. To achieve a security, Visual Cryptography is used. Visual cryptography maintains security of a cover media and also it will not make a use of encryption key. Hence, it is less prone to attack. The proposed method can achieve real reversibility, that is, data extraction and image recovery are free of any error