Abstract— Recently, reversible
data hiding (RDH) in encrypted images is the most important property that the
original cover can be lossless recovered after embedded data is extracted while
protecting the image content’s confidentiality. Due to use of embedding data by
reversibly vacating room from the encrypted images, this method may be subject
to some errors on data extraction and image restoration. In this paper, we
propose method by reserving room before encryption with a traditional
reversible data hiding algorithm, and thus it is easy for the data hider to
reversibly embed data in the encrypted image. This method can achieve real
reversibility,data extraction and image recovery are free of any error. according
to this method, it can embed more times
as large payloads for the same image quality as the previous methods, such as
for PSNR dB.
Keywords— Reversible
data hiding (RDH), Histogram shift (HS), Difference expansion (DE).
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