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Subject: search.filters.subject.data hiding

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Now showing 1 - 10 of 21
  • Thumbnail Image
    Item type:Item,
    Data Hiding in Computer-Generated Stained Glass Images and Its Applications to Information Protection
    (2020-04-01)
    Hung, Shi-Chei
    ;
    Wu, Da-Chun
    ;
    Tsai, Wen-Hsiang
    ;
    資訊工程學系
    ;
    Department of Computer Science
    The two issues of art image creation and data hiding are integrated into one and solved by a single approach in this study. An automatic method for generating a new type of computer art, called stained glass image, which imitates the stained-glass window picture, is proposed. The method is based on the use of a tree structure for region growing to construct the art image. Also proposed is a data hiding method which utilizes a general feature of the tree structure, namely, number of tree nodes, to encode the data to be embedded. The method can be modified for uses in three information protection applications, namely, covert communication, watermarking, and image authentication. Besides the artistic stego-image content which may distract the hacker's attention to the hidden data, data security is also considered by randomizing both the input data and the seed locations for region growing, yielding a stego-image which is robust against the hacker's attacks. Good experimental results proving the feasibility of the proposed methods are also included.
  • Thumbnail Image
    Item type:Item,
    Data hiding in images via multiple-based number conversion and lossy compression
    (1998-11-01)
    Wu, DC
    ;
    Tsai, WH
    ;
    資訊工程學系
    ;
    Department of Computer Science
    A novel and easy method to embed any form of secret messages into a cover image with controlled distortion is proposed. Any lossy image compressor may be applied first to a cover image to produce a lossily-processed result as the basis for embedding data in the cover image. The stego-image is produced by embedding data in each pixel of a cover image by changing its gray value without excessing the range of the gray value difference of the corresponding pixels of the cover image and its lossily-processed one. The quantity of distortion that is caused by embedding data is never in excess of that is caused by the lossy compressor. A multiple-based number system is proposed to convert the information in the secret bit stream into values to be embedded in the choosing pixels of the cover image. Pseudo-random mechanisms may be used to achieve cryptography. It is found from experiments that the values of the peaks of the signal-to-noise ratio of the stego-images are larger than those yielded by the chosen compressor, which means that the distortion in the embedding result is more imperceptible than that in the compressed one.
  • Thumbnail Image
    Item type:Item,
    The Study of Steganographic Algorithms Based on Pixel Value Difference
    (2017-01-01)
    Lee, Chin-Feng
    ;
    Shen, Jau-Ji
    ;
    Lin, Kuan-Ting
    ;
    資訊管理與財務金融系 註：原資管所+財金所
    ;
    Department of Information Management and Finance
    Wu and Tsai proposed PVD (pixel-value differencing) data hiding method in 2003. PVD partitions a cover image into non-overlapping blocks of two consecutive pixels and calculated the difference value from the two pixels in each block. This method provides an easy way to produce a more imperceptible result. Afterwards, some scholars have proposed PVD-related improvements in image quality and embedding capacity. This paper classifies and discusses the recent PVD-based methods. We will compare each PVD related method in terms of the embedding capacity and PSNR.
  • Thumbnail Image
    Item type:Item,
    A New Steganographic Method Based on Information Sharing via PNG Images
    (2010-01-01)
    Lee, Che-Wei
    ;
    Tsai, Wen-Hsiang
    ;
    資訊工程學系
    ;
    多媒體工程研究所
    ;
    Department of Computer Science
    A new steganographic method via PNG images based on the information sharing technique is proposed. The coefficients of the polynomial functions of the Shamir's (k, n)-threshold secret sharing method are utilized as carriers of a given secret data string to be hidden to generate shares. The shares then are embedded into the alpha-channel plane of a cover PNG image. The resulting stego-image with perceptible white noise is further removed by mapping computed share values into suitable ranges. Appropriate measures for enhancing the security of the proposed method are also described. Experimental results show the effect of the proposed method.
  • Thumbnail Image
    Item type:Item,
    A High-Quality Image Authentication Scheme for AMBTC-compressed Images
    (2014-12-31)
    Lin, Chia-Chen
    ;
    Huang, Yuehong
    ;
    Tai, Wei-Liang
    ;
    資訊工程學系
    ;
    Department of Computer Science
    In this paper, we present a high-quality image authentication scheme based on absolute moment block truncation coding. In the proposed scheme, we use the parity of the bitmap (BM) to generate the authentication code for each compressed image block. Data hiding is used to authenticate whether the content has been altered or not. For image authentication, we embed the authentication code to quantization levels of each image block compressed by absolute moment block truncation coding (AMBTC) which will be altered when the host image is manipulated. The embedding position is generated by a pseudo-random number generator for security concerned. Besides, to improve the detection ability we use a hierarchical structure to ensure the accuracy of tamper localization. A watermarked image can be precisely inspected whether it has been tampered intentionally or incautiously by checking the extracted watermark. Experimental results demonstrated that the proposed scheme achieved high-quality embedded images and good detection accuracy, with stable performance and high expansibility. Performance comparisons with other block-based data hiding schemes are provided to demonstrate the superiority of the proposed scheme.
  • Thumbnail Image
    Item type:Item,
    多媒體數位版權管理的服務與技術之研究
    (2008)
    蔡文祥
    ;
    TSAI WEN-HSIANG
    ;
    國立交通大學資訊工程學系(所)
    「數位典藏與數位學習國家型科技計畫」－數位典藏部份之主要的目的是要落實數 位典藏資訊的知識化與社會化，本計畫是其中之一環。本計畫之前身已經利用資訊隱藏 方法，發展出多項用來植入及保護多種影像註解及版權資訊的技術，及一套整合此等技 術的「資訊保護家InfoProtector」應用軟體。本軟體可針對BMP、JPG、GIF 以及TIFF 靜態影像與MPEG-4 動態視訊，以不同的資訊隱藏方法藏入多種資訊，以及進行自我驗 證的動作。本計畫將延伸此一成果，針對典藏服務進行數位版權管理技術研發，使成果 更契合各種數位典藏之需求。並推展網路服務，開發網路版「資訊保護家」提供數位版 權服務，使數位典藏更社會化。主要的研究重點包括：建構「多媒體DRM 與驗證中心」 與建制中心網站、研發更多樣之多媒體DRM 技術、開發更符合社會及科技脈動之DRM 服務等。 更詳言之，本計畫將以三年時間完成以下事項： 一、 「多媒體DRM 與驗證中心」之建構與網站之設計 第一年： 1. 多媒體三層驗證管理機制的建立 2. 資訊保謢家網路公開化之探討 3. 網站網頁的結構設計 第二年： 1. 驗證用資料庫的建構 2. DRM 中心之推廣及本網站與其他媒體網站的連結 第三年： 1. 網站系統的安全保護 2. 中心 DRM 工作之拓展及網站世界化之發展 二、 DRM 技術之研發 第一年： 1. 對多媒體做浮水印與驗證訊號之植入 2. 多媒體版權及竄改驗證 3. 網頁內容非法下載複製之防止 第二年： 1. 以多媒體作秘密傳輸 2. 複製已認證過影像之防止 3. 多媒體連續加浮水印之防止 第三年： 1. 多媒體秘密分享服務 2. 手機相片加 DRM 浮水印做版權保護與驗證 3. 手機視訊版權保護及下載觀看之管控 三、 DRM 服務之開發 第一年： 1. 在影像上加可視浮水印做保護及其移除 2. 以可視浮水印保護視訊之播放及其移除 3. 有可視浮水印視訊的有限次數下載 4. 中文 Email 文章之驗證 第二年： 1. PDF 之版權保護、散佈管控與破壞驗證 2. CSS 網頁之保護 3. 引用文句之保護與驗證 4. 一般網頁文字內容保護 第三年： 1. Blog 內容的存證 2. BBS 文章之保護與驗證 3. 電腦程式原始碼的保護 4. 投影片版權及內容之保護
  • Thumbnail Image
    Item type:Item,
    A system for a new two-dimensional code: Secure 2D code
    (1998-10-01)
    Yeh, CT
    ;
    Chen, LH
    ;
    資訊工程學系
    ;
    Department of Computer Science
    A new 2D code called Secure 2D code is designed in this paper, both encoder and decoder are also proposed. Secure 2D code can store any kind of data and provides high security. With regard to security, the input data is divided into two parts: general and secret. The general data is transformed into a 2D code pattern, then secret data is hidden in the 2D code pattern. To raise the reading speed and allow various reading environments, some features are added around the 2D code pattern boundary. As to the reliability, RS code is adopted to treat damaged patterns.
  • Thumbnail Image
    Item type:Item,
    Data hiding in images via multiple-based number conversion and lossy compression
    (1998-11-01)
    Wu, DC
    ;
    Tsai, WH
    ;
    資訊工程學系
    ;
    Department of Computer Science
    A novel and easy method to embed any form of secret messages into a cover image with controlled distortion is proposed. Any lossy image compressor may be applied first to a cover image to produce a lossily-processed result as the basis for embedding data in the cover image. The stego-image is produced by embedding data in each pixel of a cover image by changing its gray value without excessing the range of the gray value difference of the corresponding pixels of the cover image and its lossily-processed one. The quantity of distortion that is caused by embedding data is never in excess of that is caused by the lossy compressor. A multiple-based number system is proposed to convert the information in the secret bit stream into values to be embedded in the choosing pixels of the cover image. Pseudo-random mechanisms may be used to achieve cryptography. It is found from experiments that the values of the peaks of the signal-to-noise ratio of the stego-images are larger than those yielded by the chosen compressor, which means that the distortion in the embedding result is more imperceptible than that in the compressed one.
  • Thumbnail Image
    Item type:Item,
    A secure data hiding scheme for binary images
    (2002-08-01)
    Tseng, YC
    ;
    Chen, YY
    ;
    Pan, HK
    ;
    資訊工程學系
    ;
    Department of Computer Science
    This letter presents a novel steganography scheme capable of concealing a piece of critical information in a host message which is a binary image (e.g., a facsimile). A binary matrix and a weight matrix are used as secret keys to protect the hidden information. Given a host image of size m x n, the proposed scheme can conceal as many as [log(2) (mn + 1)] bits of data in the image by changing, at most, two bits in the host image. This scheme can provide a higher security, embed more information, and maintain a higher quality of the host image than available schemes.
  • Thumbnail Image
    Item type:Item,
    A steganographic method for images by pixel-value differencing
    (2003-06-01)
    Wu, DC
    ;
    Tsai, WH
    ;
    資訊工程學系
    ;
    Department of Computer Science
    A new and efficient steganographic method for embedding secret messages into a gray-valued cover image is proposed. In the process of embedding a secret message, a cover image is partitioned into non-overlapping blocks of two consecutive pixels. A difference value is calculated from the values of the two pixels in each block. All possible difference values are classified into a number of ranges. The selection of the range intervals is based on the characteristics of human vision's sensitivity to gray value variations from smoothness to contrast. The difference value then is replaced by a new value to embed the value of a sub-stream of the secret message. The number of bits which can be embedded in a pixel pair is decided by the width of the range that the difference value belongs to. The method is designed in such a way that the modification is never out of the range interval. This method provides an easy way to produce a more imperceptible result than those yielded by simple least-significant-bit replacement methods. The embedded secret message can be extracted from the resulting stego-image without referencing the original cover image. Moreover, a pseudo-random mechanism may be used to achieve secrecy protection. Experimental results show the feasibility of the proposed method. Dual statistics attacks were also conducted to collect related data to show the security of the method. (C) 2002 Elsevier Science B.V. All rights reserved.