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研究生： 呂坤翰
Lu, Kun Han
論文名稱： 可預防欺騙的視覺密碼機制之改良
Improvement on Cheating Prevention in Visual Cryptography
指導教授： 左瑞麟
Tso, Ray Lin
學位類別： 碩士
Master
系所名稱： 理學院 - 資訊科學系
論文出版年： 2014
畢業學年度： 102
語文別： 中文
論文頁數： 41
中文關鍵詞： 視覺密碼 、預防欺騙
外文關鍵詞： Visual Cryptography, Cheating Prevention
相關次數： 點閱：82  下載：23 
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    • 視覺密碼至從由Naor和Shamir[1]提出後，至今已延伸出許多的應用。包含圖像加密、信息隱藏、視覺的驗證和鑑定等多項研究。其中在預防詐欺方面，在Horng等人[15]提出一些參與者可以做出偽造的透明膠片來欺騙其餘的參與者後，也有不少人投入預防詐欺這部分的研究。在本文中，我們點出劉等人[18]的方案中不安全之處及有可能造成的攻擊，並提出兩個不同需求且更為安全的改善方案。

    關鍵字:視覺密碼，預防欺騙。

    Since visual cryptography was first proposed by Naor and Shamir[1], it has been extended to many applications, including image encryption, information hiding, visual authentication and identification, and so on. One issue in visual cryptography is cheating prevention visual secret sharing (CPVSS). Ever since Horng et al[15]. showed that some participants can deceive other participants using forged transparencies, many scholars have contributed to research in this area. In this study, we show that the scheme by Liu et al[18]. is unsafe and may cause an attack, and proposed two improvements with that address different needs are more secure.

    Keywords:Visual Cryptography, Cheating Prevention.

    Abstract I
    Table of Contents III
    List of Figures V
    List of Tables VI
    Chapter 1 Introduction 1
    1.1 Background 1
    1.2 Motivation and Purpose 2
    1.3 Outline 2
    Chapter 2 Background Knowledge 4
    2.1 Visual Cryptography 4
    2.2 Cheating in Visual Cryptography 5
    Chapter 3 Literature Review 9
    3.1 VSS Scheme 9
    3.2 Cheating Prevention in Visual Cryptography 11
    3.3 Improved Scheme Proposed by Chen et al 15
    3.3.1 Attack Method 15
    3.3.2 Scheme Revisit 16
    3.4 Improved Scheme Proposed by Liu et al 19
    3.4.1 Scheme Revisit 19
    3.4.2 Analysis of Liu et al.’s Scheme 23
    Chapter 4 Proposed Scheme 25
    4.1 Scheme 1 25
    4.2 Scheme 2 28
    Chapter 5 Security Analysis 33
    5.1 Security Analysis for Scheme 1 33
    5.2 Security Analysis for Scheme 2 34
    Chapter 6 Conclusion and future rearch 37
    References 38

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    [17]Y.C. Chen, G. Horng, and D.S. Tsai, “Comment on ‘Cheating Prevention in Visual Cryptography’,” IEEE Transactions, Image Processing,vol.21, no.7, pp.3319-3323, 2012.

    [18]S.C. Liu, M. Fujiyoshi, and H. Kiya, “A cheat-prevention visual secret sharing scheme with efficient pixel expansion”IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences,vol. E96-A, no. 11, pp. 2134-2141, 2013.

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    [21]Y.C. Chen, D.S. Tsai, G.Horng, “Visual secret sharing with cheating prevention revisited” Digital Signal Processing, Vol. 23, Issue 5, pp. 1496-1504, 2013.

    [22] H.Yan, Z. Gan, and K. Chen, “A cheater detectable visual cryptography scheme,” (in Chinese) Journal of Shanghai Jiaotong University, vol. 38, no. 1, 2004.

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