A steganographic method based upon JPEG and quantization table modification

  • Authors:

  • Chin-Chen Chang;Tung-Shou Chen;Lou-Zo Chung

  • Affiliations:

  • Department of Computer Science and Information Engineering, National Chung Cheng University, Chiayi 62107, Taiwan, ROC;Department of Computer Science and Information Management, Providence University, Taichung 433, Taiwan, ROC;Department of Computer Science and Information Engineering, National Chung Cheng University, Chiayi 62107, Taiwan, ROC

  • Venue:
  • Information Sciences—Informatics and Computer Science: An International Journal - Special issue: Intelligent multimedia computing and networking
  • Year:
  • 2002

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Abstract

In this paper, a novel steganographic method based on joint photographic expert-group (JPEG) is proposed. The proposed method modifies the quantization table first. Next, the secret message is hidden in the cover-image with its middle-frequency of the quantized DCT coefficients modified. Finally, a JPEG stego-image is generated. JPEG is a standard image and popularly used in Internet. The stego-image will not be suspected if we could apply a JPEG image to data hiding. We compare our method with a JPEG hiding-tool Jpeg-Jsteg. From the experimental results, we obtain that the proposed method has a larger message capacity than Jpeg-Jsteg, and the quality of the stego-images of the proposed method is acceptable. Besides, our method has the same security level as Jpeg-Jsteg.