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A Steganography Based on Optimal Multi-Threshold Block Labeling

Computer Systems Science & Engineering 2023年第1期44卷 721-739页

作者： Shuying Xu Chin-Chen Chang Ji-Hwei Horng Department of Information Engineering and Computer Science Feng Chia UniversityTaichung407Taiwan Department of Electronic Engineering National Quemoy UniversityKinmen892Taiwan

Hiding secret data in digital images is one of the major researchfields in information ***,reversible data hiding in encrypted images has attracted extensive attention due to the emergence of cloud *** paper proposes a novel reversible data hiding method in encrypted images based on an optimal multi-threshold block labeling technique(OMTBL-RDHEI).In our scheme,the content owner encrypts the cover image with block permutation,pixel permutation,and stream cipher,which preserve the in-block correlation of pixel *** uploading to the cloud service,the data hider applies the prediction error rearrangement(PER),the optimal threshold selection(OTS),and the multi-threshold labeling(MTL)methods to obtain a compressed version of the encrypted image and embed secret data into the vacated *** receiver can extract the secret,restore the cover image,or do both according to his/her granted *** proposed MTL labels blocks of the encrypted image with a list of threshold values which is optimized with OTS based on the features of the current *** results show that labeling image blocks with the optimized threshold list can efficiently enlarge the amount of vacated room and thus improve the embedding capacity of an encrypted cover *** level of the proposed scheme is analyzed and the embedding capacity is compared with state-of-the-art *** are concluded with satisfactory performance.

关键词： Reversible data hiding encryption image prediction error compression multi-threshold block labeling

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