題  目：分散式雲網路上的秘密圖像共享

内容簡介：所謂的秘密圖像共享是将秘密共享擴展到分享數字圖像。(k, n)秘密圖像共享是結合了密碼學的秘密共享技術，和數字圖像處理方法的重要研究領域。秘密圖像被分享成n個子圖像，并且可以從任何k個子圖像恢複秘密圖像。但是，不能從（k-1）或更少的子圖像獲得任何秘密信息。到現在為止，研究秘密圖像共享的文獻已有很多，研究者們提出了大量有特定功能的各種方案，可做多樣性的應用。例如，具備認證功能、具備漸進式解密、具有意義的子影像、可共享多個秘密圖像等秘密圖像共享方案。還有，研究特殊規定的門檻組合，例如，(t, s, k, n)秘密圖像共享與(t, k, n)秘密圖像共享等。這個講座讨論網路與秘密圖像共享結合的問題。在此之前，所有(k, n)秘密圖像共享方案并無法在分散式雲網路(Distributed Cloud Network; DCN)，公開地回複秘密圖像。為了在DCN上實現安全的秘密圖像回複，所有參與回覆秘密圖像的參與者之間需建立安全通信渠道。一個簡單的安全通信渠道實現，是使用額外的密鑰分分配協議為參與者提供一個公共密鑰。本講座引入了多變數對稱姓多項式設計了DCN上的(k, n)秘密圖像共享。它仍然具有門檻值特性（從任何k個子圖像恢複秘密圖像），同時提供在DCN上的安全秘密圖像回複。這個方案可以非交互地共享密鑰，讓參與者之間建立安全通信渠道。

報告人：台灣國立東華大學  楊慶隆  教授

報告人簡介：Professor Ching-Nung Yang obtained his Ph. D. degree in Electrical Engineering from National Cheng Kung University. His B.S. and M.S. degrees, both were awarded in Department of Telecommunication Engineering from National Chiao Tung University. Dr. Yang served in National Dong Hwa University since 1999. His current title is Professor in Department of Computer Science and Information Engineering. He had been Visiting Professor to University of Missouri Kansas City, University of Milan, and University of Tokyo. He is currently a Fellow of IET (IEE) and an IEEE senior member. Professor Yang has done extensive researches on visual cryptography and secret image sharing, and is the chief scientist in both areas. In fact, a very important innovation of visual cryptography, the probabilistic visual cryptography, was firstly proposed by Professor Yang. His areas of interest include error correcting code, multimedia security, cryptography, and information security. He has authored two books and has published over 250 (including more than 120 SCI-indexed papers) professional research papers in the areas of information security and coding theory. In the meantime, he has served/is serving in international academic organizations. He serves as technical reviewers for over 40 major scientific journals in the areas of his expertise, and serves as editorial boards and editors of special issues for some journals. Also, he was invited as chairs, keynote speakers, and members of program committees for various international conferences. He is the recipient of the 2000, 2006, 2010, 2012, and 2014 Fine Advising Award in the Thesis of Master/PhD of Science awarded by Institute of Information & Computer Machinery.

時  間：2019年10月9日（周三）上午10：30始

地  點：南海樓338室

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