Abstract
Reversible Data Hiding (RDH) has been under research for the past two decades. Recently RDH in encrypted images (RDH-EI) draws more attention among the researchers. Since it is used effectively in privacy protection and cloud computing. In this paper, a RDH-EI using LSB based odd-even embedding technique scheme is proposed. Initially the cover image is encrypted using block and pixel scrambling and bit plane mix ordering. Block and pixel scrambling is done through four random walks/Space Filling Curves (SFCs). Each block and pixel is tested for randomness of information source through each random walk. Finally the secret message is embedded in each block of image based on testing the pixel value and position value in the block using LSB embedding. This method avoids overflow/underflow issues that usually happens in RDH/LSB embedding.
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