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| 1 | Steganography in low bit-rate speech streams based on quantization index modulation controlled by keys显示文摘Since low bit-rate speech codecs used for voice over internet protocol(VoIP), such as iLBC(internet low bit-rate codec), G.723.1and G.729 A, have less redundancy due to high compression, it is more challenging to embed information in low bit-rate speech streams of VoIP. In this study, a new method is proposed for steganography in low bit-rate speech streams of VoIP. The core idea of this method is setting up a graph model for the codebook space of the quantizer. Based on the graph model, the method realises a quantization index modulation(QIM)-controlled algorithm for partitioning the codebook space. It can be proved that this method can minimize signal distortion while steganography taking place. Taking into account codeword partition balance and partition diversity, the proposed steganographic algorithm was based on QIM controlled by secret keys, i.e., mapping the ways of codebook division into secret keys, thereby significantly improving the undetectability and robustness of VoIP steganography. Performance measurements and steganalysis experiments showed that the proposed QIM-controlled steganographic algorithm was more secure and robust than the QIM algorithm, the conventional RANDOM algorithm and the original codebook algorithm. | HUANG YongFeng TAO HuaiZhou XIAO Bo CHANG ChinChen | 2017 | Science China(Technological Sciences)2017，60，10： | 5 |
| 2 | An SVD Oriented Watermark Embedding Scheme With High Qualities for The Restored Images 显示文摘 | Chang Chinchen Lin Chiachen Hu Yihshin | 2007 | Computing Information and Control2007，3，3： | 1 |
| 3 | A new forward-se- cure blind signature scheme显示文摘 | Huang Huifeng Chang Chinchen | 2007 | Journal of Engineer- ing and Applied Sciences2007，2，1： | 1 |
| 4 | SVD -based Digital Image Watermarking Scheme 显示文摘 | Chang Chinchen Piyu Tsai Lin Chiachen | 2005 | Pattern Recognition Letters2005，26，8： | 1 |
| 5 | A watermarking-based image, ownership and tampering authentication scheme显示文摘 | Chang Chinchen Hu Yihshin Lu Tzuehuen | 2006 | Pattern Recognition Letters2006，，27： | 1 |
| 6 | A new lossless compression scheme based on Huffman coding scheme for image compression显示文摘 | Hu Yuchen Chang chinchen | 2000 | Signal Processing Image Communication2000，16，： | 1 |
| 7 | A reversible data hiding scheme using complementary embedding strategy 显示文摘 | Chang Chinchen Due Kieu | 2010 | Information Sciences2010，180，16： | 1 |
| 8 | Sharing a verifiable secret image using two shadows显示文摘 | Chang Chinchen Lin Chiachen Le T | 2009 | Pattern Recognition2009，42，11： | 1 |
| 9 | Novel image copy detection with rotating tolerance显示文摘 | Wu Mingni Lin Chachen Chang Chinchen | 2007 | Journal of Systems and Software2007，80，7： | 1 |
| 10 | Self-embedding fi'agile watermarking with restoration capability based on adaptive bit allocation mechanism 显示文摘 | Qin Chuan Chang Chinchen Chen Peiyu | 2012 | Signal Processing2012，，92： | 1 |
| 11 | Multilevel reversible dwata hidwing basedw on histogram modwification of dwifference ima-ges显示文摘 | Lin Chiachen Tai Weiliang Chang Chinchen | | 0，，41： | 1 |
| 12 | A steganographic method based upon JPEG and quantization table modification显示文摘 | Chang Chinchen Chen Tungshou Chung Louzo | 2002 | Information Sciences2002，141，： | 1 |
| 13 | Using set partitioning in hierarchical trees to authenticate digital images显示文摘 | Tsai P Hu Yuchen Chang Chinchen | 2003 | Signal Processing: Image Communication2003，，18： | 1 |
| 14 | Edge Detection Using Block Truncation Coding显示文摘 | HU Yuchen CHANG Chinchen | 2003 | International Journal Pattern Recognition and Artificial Intelligence2003，17，6： | 1 |
| 15 | Graph structure analysis based on complex network 显示文摘 | Tang Jin Jiang Bo Chang Chinchen | 2012 | Digital Signal Processing2012，22，5： | 1 |
| 16 | High Payload Data Embedding with Hybrid Strategy 显示文摘 | ChinChen Chang YungChen Chou | 2007 | Intelligent Information Hiding and Multimedia Signal Processing2007，1，： | 1 |
| 17 | A fast LBG codebook training algorithm for vector quantization 显示文摘 | Chang Chinchen HU Yuchen | 1998 | IEEE transactions on Consumer Electronics1998，44，4： | 1 |
| 18 | Digital Signature with Message Recovery Using Self-Certified Public Keys Without Trustworthy System Authority 显示文摘 | CHANG Yafen CHANG Chinchen HUANG Huifeng | 2005 | Applied Mathematics and Computation2005，161，1： | 1 |
| 19 | Finding optimal least-significant-bit substitution in image hiding by dynamic programming strategy显示文摘 | Chang Chinchen Yuan Ju Hsiao | 2003 | Pattern Recognition2003，36，7： | 1 |
| 20 | Novel image copy detection with rotating tolerance显示文摘 | Lin Chiachen Wu Mingni Chang Chinchen | 2007 | Journal of Systems and Software2007，80，7： | 1 |
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