1. College of Computer Science and Technology, Huaqiao University, Xiamen, Fujian 361021, China;
2. Department of Electronic Engineering, Tsinghua University, Beijing 100084, China;
3. Network Technology Center, Huaqiao University, Xiamen, Fujian 361021, China
In this paper,we first analyze the unequal impacts of various cover bits on the quality of decoded speech for parameter codecs,and further design a ranking scheme for available cover bits to utilize the cover fully.Moreover,we present an adaptive VoIP steganography based upon the performance ranking of cover bits,which can adaptively choose the optimal steganographic positions to enhance the imperceptibility of covert communications.The proposed methods are evaluated and tested with a large number of speech samples as the cover.The experimental results show that the proposed ranking scheme is sound and feasible,and the presented steganogaphic method also outperforms the existing ones.
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2016, Vol. 44 
