Computer Science ›› 2019, Vol. 46 ›› Issue (1): 196-200.doi: 10.11896/j.issn.1002-137X.2019.01.030

• Information Security • Previous Articles     Next Articles

Asymmetric JPEG Steganography Based on Correlation in DCT Domain

MAO Bing-hua, WANG Zi-chi, ZHANG Xin-peng   

  1. (School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China)
  • Received:2017-12-18 Online:2019-01-15 Published:2019-02-25

Abstract: The current distortion functions used for JPEG steganography allocate a same embedding cost for ±1 embedding change.However,due to the correlation of DCT domain in JPEG images,the effects of ±1 to modifying the content of the image are different,so the corresponding embedding cost should also be different.Based on the DCT correlation concept,a universal cost-value optimization method suitable for JPEG steganography was proposed in this paper,which mainly considers the correlation of the coefficients in the same position of adjacent DCT blocks in the JPEG image.The current DCT coefficients are predicted by averaging the DCT coefficients of the same position in the eight neighborhood blocks.For the existing JPEG distortion function,the embedding cost for ±1 is differentiated by the principle of moving closer to the predicted value.The adjusted embedding cost can guide the stego-modified DCT coefficients to move closer to the predicted value and enhance the correlation of the DCT domain to improve steganographic security.This method can be used in combination with any existing JPEG distortion function.Experimental results show that this method can increase the security of the existing JPEG steganography by 2.4% of test error on average without increasing the time complexity of the original algorithm.

Key words: Steganography, JPEG images, Distortion cost, Eight neighborhoods

CLC Number: 

  • TP309
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