Effects of Random Sign Encryption in JPEG 2000-Based Data Hiding

This paper proposes random sign encryption in JPEG 2000-based data hiding. By multiplying random signs to the discrete wavelet transformed coefficients of an image, the image is visually encrypted. Full and partial random sign encryption is studied in this paper, and effects of both are investigated. From experimental results, both full and partial random sign encryption does not degrade the quality of compressed images. In addition, the compression ratio can still be controlled well when random sign encryption is applied. Moreover, partial random sign encryption is enough for image visual encryption. With data hiding, random sign encryption does not degrade the quality of images containing hidden data, and 100% correct hidden data extracting rate has been achieved.