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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 | Mechanism of methanol synthesis from CO2/CO/H2 mixtures over copper/zinc oxide/alumina catalysts: Use of ^14C-labelled reactions显示文摘 | Chinchen G C Denny P J Parker D G | 1987 | Applied Catalysis1987，30，2： | 1 |
| 6 | The activity and state of the copper surface in methanol synthesis catalysts显示文摘 | Chinchen G C Waugh K C Whan D A | 1986 | Applied Catalysis1986，25，1： | 1 |
| 7 | Synthesis of methanol显示文摘 | Chinchen G C Denny P J Jennings J R | 1998 | Appl catal1998，36，： | 1 |
| 8 | 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 |
| 9 | 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 |
| 10 | Synthesis of methanol:Part 1 catalysts and kinetics显示文摘 | DENNY P J JENN INGS J R SPENCER M S WAUGH K C | 1988 | Appl Catal1988，36，： | 1 |
| 11 | A reversible data hiding scheme using complementary embedding strategy 显示文摘 | Chang Chinchen Due Kieu | 2010 | Information Sciences2010，180，16： | 1 |
| 12 | Sharing a verifiable secret image using two shadows显示文摘 | Chang Chinchen Lin Chiachen Le T | 2009 | Pattern Recognition2009，42，11： | 1 |
| 13 | 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 |
| 14 | Mechanism of methanol synthesis from CO2/CO/H2 mixtures over copper/zinc oxide/alumina catalysts:Use of 14C-labelled reactants显示文摘 | Chinchen G C Denny P J Parker D J | 1987 | Appl Catal1987，30，： | 1 |
| 15 | 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 |
| 16 | Synthesis of methanol: Ⅰ Catalysts and kinetics 显示文摘 | CHINCHEN G C DENNY P J JENNINGS J R SPENCER M S WAUGH K C | 1988 | Appl Catal1988，36，： | 1 |
| 17 | Mechanism of methanol synthesis from CO2/CO/H2 mixtures over copper/zinc oxide/alumina catalysts:Use of14 C-labelled reactants显示文摘 | CHINCHEN G C DENNY P J PARKER D G SPENCER M S WHAN D A | 1987 | Appl Catal1987，30，2： | 1 |
| 18 | Improved moment invariants for shape discrimination 显示文摘 | CHINCHEN C | 1993 | Pattern Recognition1993，26，5： | 1 |
| 19 | 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 |
| 20 | Mechanism of methanol synthesis from COJCO/H2 mixtures over copper/Zinc oxide/Alumina catalysts: use of 14C-labelled reactants 显示文摘 | CHINCHEN G C DENNY P J PARKER D G | 1987 | Applied Catalysts1987，30，2： | 1 |
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