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Divide-and-rule strategy is popularly adopted in steganography based on Voice-over-IP (VoIP), which often divides a cover into many small parts and performs embedding operation on each one to maintain the real-time requirement of VoIP services. No existing study, however, notices that the cover length of the parts may seriously affect the embedding performance. The goal of this paper is to fill in...
To reduce the distortion while maintaining relatively large embedding capacity, a steganographic scheme based on random binary matrix is presented in this paper. We first design a 3×4 covering code, which can hide 3 bits of secret messages into 4 bits of cover messages with not more than 2-bit changed. Further, we construct a random binary matrix with cover bits at diagonal lines for steganography,...
For steganography over speech frames, least-significant-bit (LSB) approach has been one of the most important alternatives. However, its embedded capacity is quite limited, due to the low redundancy characteristic of low bitrate speech. Thus, we suggest a novel least significant digit (LSD) method in this paper, which makes full use of the frame bits to hide secret messages and provides a larger embedding...
Although steganographic transparency and steganographic bandwidth are believed to be two conflicting objectives in the design of steganographic systems, it is possible and necessary to strike an optimal balance between them. This paper presents an adaptive partial-matching steganography for voice over IP (VoIP). We introduce the notion of partial similarity value (PSV) to evaluate the partial matching...
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