Transparent and perceptually enhanced JPEG image encryption

Authors:
Bian Yang;Chong-Qing Zhou;Christoph Busch;Xia-Mu Niu
Affiliations:
Norwegian Information Security Laboratory, Gjøvik University College, Norway and Department of Computer Science and Technology, Harbin Institute of Technology, China;Department of Computer Science and Technology, Harbin Institute of Technology, China;Norwegian Information Security Laboratory, Gjøvik University College, Norway;Department of Computer Science and Technology, Harbin Institute of Technology, China
Venue:
DSP'09 Proceedings of the 16th international conference on Digital Signal Processing
Year:
2009

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Abstract

In many applications encryption/decryption of compressed images or videos is desired to be transparent to the compression decoder to maintain the file format, file size and content-relevant functionalities. We propose in this paper a transparent encryption mechanism for JPEG-encoded image files to meet the requirements of format-compliance and file-size preservation. The algorithm is based on a special cross-block Varied-Length Codes (VLC) shuffling method perceptually enhanced by a reversible histogram spreading processing, which tends to smoothly re-distribute VLCs among spatial blocks in a reversible way. The algorithm performs visually better than existing shuffling based schemes against content leakage attacks such as DC value removal.