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Calibration based universal JPEG steganalysis

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science in china(Series F) 2009年第2期52卷 260-268页

作者： huang FangJun1,2 & huang jiwu1,2 1 school of information science and technology,Sun Yat-Sen university,guangzhou 510275,china 2 Guangdong Key Lab. of information Security technology,Sun Yat-Sen university,guangzhou 510275,china school of information science and technology Sun Yat-Sen University Guangzhou China Guangdong Key Lab. of information Security technology Sun Yat-Sen University Guangzhou China

For steganalysis of JPEG images, features derived in the embedding domain appear to achieve a preferable performance. However, with the existing JPEG steganography, the minor changes due to the hidden secret data are not easy to be explored directly from the quantized block DCT （BDCT） coefficients in that the energy of the carrier image is much larger than that of the hidden signal. In this paper, we present an improved calibration-based universal JPEG steganalysis, where the microscopic and macroscopic calibrations are combined to calibrate the local and global distribution of the quantized BDCT coefficients of the test image. All features in our method are generated from the difference signal be- tween the quantized BDCT coefficients of the test image and its corresponding microscopic calibrated image, or calculated as the difference between the signal extracted from test image and its corresponding macroscopic calibrated image. The extracted features will be more effective for our classification. Moreover, through using the Markov empirical transition matrices, both magnitude and sign dependencies along row scanning and column scanning patterns existed in intra-block and inter-block quantized BDCT coefficients are employed in our method. Experimental results demonstrate that our proposed scheme outperforms the best effective JPEG steganalyzers having been presented.

关键词： JPEG steganography steganalysis microscopic calibration macroscopic calibration

Steganalysis of stochastic modulation steganography

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science in china(Series F) 2006年第3期49卷 273-285页

作者： HE Junhui1,2 & huang jiwu1,2 1. school of information science and technology, Sun Yat-sen university, guangzhou 510275, china 2. Guangdong Province Key Laboratory of information Security, guangzhou 510275, china school of information science and technology Sun Yat-sen University Guangzhou China Guangdong Province Key Laboratory of information Security Guangzhou China

Stochastic modulation steganography embeds secret message within the cover image by adding stego-noise with a specific probabilistic distribution. No method is known to be applicable to the estimation of stochastic modulation steganography. By analyzing the distributions of the horizontal pixel difference of images before and after stochastic modulation embedding, we present a new steganalytic approach to accurately estimate the length of secret message in stochastic modulation steganography. The pro- posed method first establishes a model describing the statistical relationship among the differences of the cover image, stego-image and stego-noise. In the case of stegoimage-only steganalysis, rough estimate of the distributional parameters of the cover image＇s pixel difference is obtained with the use of the provided stego-image. And grid search and Chi-square goodness of fit test are exploited to estimate the length of the secret message embedded with stochastic modulation steganography. The experimental results demonstrate that our new approach is effective for steganalyzing stochastic modulation steganography and accurately estimating the length of the secret message.

关键词： information hiding steganography steganalysis stochastic modulation statistical distribution models of difference.

Robust AVS audio watermarking

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science china(information sciences) 2010年第3期53卷 607-618页

作者： WANG Yong & huang jiwu Guangdong Key Laboratory of information Security technology, school of information science and technology, Sun Yat-Sen university, guangzhou 510275, china Guangdong Key Laboratory of information Security technology School of Information Science and Technology Sun Yat-Sen University Guangzhou China

Part Ⅲ of AVS (china Audio and Video Coding Standard) is the first generic audio standard proposed in china and is becoming popular in some applications. For MP3 audio, some effiorts have been made to solve the copyright pirating and malicious modifications by the way of watermarking. To our best knowledge, similar work on the AVS audio has not been explored. In this paper, we present a novel robust watermarking algorithm for AVS audio. We find that the frame type in the AVS coded process can be used as a robust feature for watermarking. Then we design a novel watermarking algorithm which is integrated into the AVS audio coding process. The watermark bits are embedded into the compressed bit stream. At the extracting end, the watermark bits can be extracted from the compressed bit stream directly. This algorithm achieves robustness to decoding/re-coding attacks, and has low computation complexity for both embedding and extracting while preserving the quality of the audio signals.

关键词： AVS audio security problems robust watermarking

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利用可逆网络的音频藏图算法

西安电子科技大学学报 2024年第4期51卷 226-238页

作者：张晓虹项世军黄红斌暨南大学信息科学技术学院广东广州510632

可逆网络因其具有天然可逆的结构,非常适用于信息隐藏领域。图像能以生动直观、有层次的方式传递信息,而音频是一种广泛传播和使用的媒体文件,具有较大的嵌入容量,因此在音频中隐藏图像具有较高的研究和应用价值。在音频藏图任务中,如... 详细信息

可逆网络因其具有天然可逆的结构,非常适用于信息隐藏领域。图像能以生动直观、有层次的方式传递信息,而音频是一种广泛传播和使用的媒体文件,具有较大的嵌入容量,因此在音频中隐藏图像具有较高的研究和应用价值。在音频藏图任务中,如何表征音频和图像数据以及如何在减少音频失真的同时提高重建图像的质量是两个重要的问题。针对这两个问题,提出了一种基于可逆网络的音频藏图算法。对于数据特征表示,受到JPEG图像压缩中数据处理方法的启发,提出了图像特征提取与表示模块,该模块对彩色图像依次进行分块离散余弦变换、锯齿扫描和高低频分离操作,提取出图像的频域特征并得到其一维表示。此外,为了减少音频失真并提高重建图像的质量,利用小波变换分离音频的高低频分量并引入可逆网络将秘密图像嵌入到载体音频的高频区域中。实验结果表明,所提出的算法在实现高嵌入率的同时,能生成质量更高的隐写音频以及重建出更加还原的彩色图像,且算法具有较高的安全性。

关键词：隐写图像隐藏可逆网络小波变换离散余弦变换

Discriminating between photorealistic computer graphics and natural images using fractal geometry

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science in china(Series F) 2009年第2期52卷 329-337页

作者： PAN Feng CHEN JiongBin huang jiwu Guangdong Key Lab of information Security technology School of Information Science and Technology Sun Yat-Sen UniversityGuangzhou 510275 China

Rendering technology in computer graphics （CG） is now capable of producing highly photorealistic images, giving rise to the problem of how to identify CG images from natural images. Some methods were proposed to solve this problem. In this paper, we give a novel method from a new point of view of image perception. Although the photorealistic CG images are very similar to natural images, they are surrealistic and smoother than natural images, thus leading to the difference in perception. A pert of features are derived from fractal dimension to capture the difference in color perception between CG images and natural images, and several generalized dimensions are used as the rest features to capture difference in coarseness. The effect of these features is verified by experiments. The average accuracy is over 91.2%.

关键词： image forensics computer graphics natural image fractal image authentication

Image processing operations identification via convolutional neural network

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science china(information sciences) 2020年第3期63卷 275-281页

作者： Bolin CHEN Haodong LI Weiqi LUO jiwu huang Guangdong Key Laboratory of information Security technology School of Data and Computer Science Sun Yat-sen University College of information Engineering Shenzhen University

Dear editor,In recent years, image forensics has attracted increasing attention, and many forensic methods have been proposed for identifying image processing operations. Until now, most existing methods have been based on hand-crafted features, and only one specific operation is considered in these methods. In many forensic scenarios, however,

关键词： image Image processing operations identification via convolutional neural network

Efficient Tate pairing computation using double-base chains

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science in china(Series F) 2008年第8期51卷 1096-1105页

作者： ZHAO ChangAn ZHANG FangGuo huang jiwu school of information science and technology Sun Yat-Sen University Guangdong Key Laboratory of Information Security Technology Guangzhou 510275 China

Pairing-based cryptosystems have developed very fast in the last few years. The efficiencies of these cryptosystems depend on the computation of the bilinear pairings, In this paper, a new efficient algorithm based on double-base chains for computing the Tate pairing is proposed for odd characteristic p 〉 3. The inherent sparseness of double-base number system reduces the computational cost for computing the Tate pairing evidently. The new algorithm is 9% faster than the previous fastest method for the embedding degree k = 6.

关键词： public key cryptography Tate pairing elliptic curves double-base chains

Non-ambiguity of blind watermarking:a revisit with analytical resolution

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science in china(Series F) 2009年第2期52卷 276-285页

作者： KANG xiangui huang jiwu ZENG WenJun SHI Yun Q. school of information science & technology Sun Yat-Sen University Guangzhou 510275 China Department of CS University of Missouri-Columbia MO65211 USA Department of ECE New Jersey Institute of Technology NJ 07102 USA

Resistance to ambiguity attack is an important requirement for a secure digital rights management （DRM） system. In this paper, we revisit the non-ambiguity of a blind watermarking based on the computational indistinguishability between pseudo random sequence generator （PRSG） sequence ensemble and truly random sequence ensemble. Ambiguity attacker on a watermarking scheme, which uses a PRSG sequence as watermark, is viewed as an attacker who tries to attack a noisy PRSG sequence. We propose and prove the security theorem for binary noisy PRSG sequence and security theorem for general noisy PRSG sequence. It is shown that with the proper choice of the detection threshold Th = α n （a is a normalized detection threshold; n is the length of a PRSG sequence） and n i≥ 1.39 × m/α^2 （m is the key length）, the success probability of an ambiguity attack and the missed detection probability can both be made negligibly small thus non-ambiguity and robustness can be achieved simultaneously for both practical quantization-based and blind spread spectrum （SS） watermarking schemes. These analytical resolutions may be used in designing practical non-invertible watermarking schemes and measuring the non-ambiguity of the schemes.

关键词： watermarking ambiguity attack PRSG sequence computational indistinguishability digital rights management (DRM)

Survey of information security

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science in china(Series F) 2007年第3期50卷 273-298页

作者： SHEN Changxiang ZHANG huangGuo FENG DengGuo CAO ZhenFu huang jiwu Computing technology Institute of china Navy Beijing 100841 China school of Computer Wuhan University Wuhan 430072 China Institute of Software Chinese Academy of Sciences Beijing 100080 China Department of Computer science and technology Shanghai Jiaotong University Shanghai 200030China information technology Institute Zhongshan University Guangzhou 510275 China

The 21st century is the age of information when information becomes an important strategic resource. The information obtaining, processing and security guarantee capability are playing critical roles in comprehensive national power, and information security is related to the national security and social stability. Therefore, we should take measures to ensure the information security of our country. In recent years, momentous accomplishments have been obtained with the rapid development of information security technology. There are extensive theories about information security and technology. However, due to the limitation of length, this article mainly focuses on the research and development of cryptology, trusted computing, security of network, and information hiding, etc.

关键词： information security cryptology trusted computing network security information hiding