Digital steganography: hiding data within data

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A steganographic method for images by pixel-value differencing (2003, background): “However, new issues also arose and have been explored ( Artz, 2001; Zhao et al., 1998), such as data security in digital communications, copyright protection of digitized properties, invisible communication via digital media, etc.”
Reversible image hiding scheme using predictive coding and histogram shifting (2009, background): “Quite a few data hiding schemes modify the original medium to embed the secret message without the capability to recover the host medium after the secret message is extracted [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11].”
Genetic watermarking based on transform-domain techniques (2004, methodology): “We can also employ the human visual system (HVS) model [2,3,14] for evaluating the watermarked image quality, and this part of work is being in progress for the future works of this paper.”
An overview of image steganography (2005, methodology): “, “Steganographic techniques and their use in an Open-Systems environment”, SANS Institute, January 2002 [8] Artz, D.”
Adaptive Data Hiding in Edge Areas of Images With Spatial LSB Domain Systems (2008, methodology): “Steganographic methods [ 3 ]–[8] overcome this problem by hiding the secret information behind a cover, and the result does not attract any special attention.”