502 research outputs found
AN IMPROVED MULTI-STAGE SECRET SHARING SCHEME BASED ON THE FACTORIZATION PROBLEM
No full textLee and Hwang proposed a multi-stage (t, n) secret sharing scheme which has fewer public values than pervious schemes. In their scheme, a group of participants share multiple secrets stage-by-stage, and only one secret share should been kept by each participant. However, in this article, we will show that multiple secrets cannot, in fact, be reconstructed stage-by-stage by the secret holder's determination and that the secret holder cannot determine the values of the secrets in Lee and Hwang's scheme. Moreover, their scheme belongs to the family of one-time-use schemes. At the same time, we shall also modify their scheme to improve the above weaknesses and show the improved scheme can be applied. The security of the proposed scheme is based on the factorization problem which provides higher security confidenc than using the hash function in Ham's and Chang et al.'s multi-stage secret sharing schemes
Istanbul University Library T.Y. transcription and content analysis of song magazine no. 03276
No full textBu çalışmada 19. yüzyılın ikinci yarısında kaleme alındığı tahmin edilen İstanbul Üniversitesi T.Y. 03276 numarada kayıtlı bulunan "Şarkı Mecmuası" incelenmiştir. Mecmuanın müellif kaydı bulunmamaktadır. Üç bölümden oluşan çalışmanın birinci bölümünde mecmuanın tanımı ve tasnifi yapılmış, güfte mecmuaları hakkında bilgiler verilmiştir. İkinci bölümde çalışmaya konu olan mecmua, "Muhteva" ve "Şekil Hususiyetleri" başlıkları altında incelenmiş "Mecmuanın İncelenmesinde Gözetilen Esaslar" başlığı altında metnin kuruluşu ve imlâ problemlerine de yer verilmiştir. Mecmuadan faydalanmayı kolaylaştırmak maksadıyla muhtevası ile ilgili tablolar hazırlanmıştır. Üçüncü bölümde metnin Osmanlıcadan günümüz harflerine aktarımı verilmiştir. Ayrıca metin içerisinde yer almayan fakat Divan Makam ve Türk Sanat Müziği Nota Arşivi gibi kaynaklarda tespit edilen bazı bilgilere de dipnot ve tablolarda yer verilmiştir.In this study, the "Şarkı Mecmuası" (Song Anthology), registered under the number T.Y. 03276 at Istanbul University, which is estimated to have been compiled in the second half of the 19th century, has been examined. The manuscript does not contain any information regarding its author. The study consists of three main sections. In the first section, the anthology is defined and classified, and general information about güfte mecmuası (lyrics anthologies) is provided. The second section analyzes the manuscript in terms of its "Content" and "Formal Characteristics," and addresses the principles followed in the examination of the text, including issues related to orthography and textual structure. To facilitate the use of the anthology, several tables regarding its content have been prepared. In the third section, the text has been transcribed from Ottoman Turkish into the modern Turkish alphabet. Furthermore, additional information not found in the manuscript but identified in sources such as the Divan Makam and Turkish Classical Music Notation Archive has been included in the footnotes and tables
Author correction: Clear and transparent nanocrystals for infrared-responsive carrier transfer
No full textThe original version of this Article omitted the fourth author Taizo Yoshinaga, who is from the 'Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Japan'. Consequently, the third sentence of the Author Contributions, 'M.S. and M.K. synthesized the ITO NCs and ITO/semiconductor oxides' was revised to 'M.S., M.K. and T.Y. synthesized the ITO NCs and ITO/semiconductor oxides'. This has been corrected in both the PDF and HTML versions of the Article
The study of remote user authentication protocol
No full text碩士電腦與網路技術的成熟與普及，使得合法使用者或電腦之間資料可以從遠端輕易的登入另一台電腦。遠端的登入者是否合法就變成一個很重要的問題。因為通行碼的成本較低，且方便並符合人類行為方便，所以一般還是使用通行碼來實現遠端身份鑑別。過去，陸續有很多學者提出遠端身份鑑別的相關研究，但是他們所提出的方法，在安全上尚待加強，或是必須使用較高的計算量。因此，本論文提出一種較安全的遠端身份鑑別機制，它可以抵擋通行碼猜測攻擊(password guessing attack)、偽裝伺服器攻擊(server spoofing)、通行碼驗證資訊遭竊後之攻擊(stolen-verifier attack)、重送攻擊(replay attack)、阻斷服務攻擊(denial of service attack)等五種攻擊方法。另外，我們的方法在做完遠端身份鑑別機制後，遠端系統和使用者會產生一把共有會議金鑰(session key)，方便登入後伺服端與需求端可以藉以進行其他資訊安全機制。而我們的方法所產生會議金鑰，滿足了session-key security、known-key security和forward secrecy等三種安全特性。In 2002, Lee, Li and Hwang proposed the remote user authentication protocol but their scheme is not secure. It suffered password guessing attack, stolen-verifier attack, denial of service attack and server spoofing. Therefore, we propose the improved scheme based on Lee-Li-Hwang scheme. According to the concepts of BAN logic, we provide the proof of session key authentication.第1章 緒言.............................................1
第1.1節 研究動機與目的...............................1
第1.2節 遠端身份鑑別機制之安全需求...................4
第1.3節 論文的結構...................................6
第2章 相關研究方法.....................................7
第2.1節 符號定義.....................................7
第2.2節 簡述Lee-Li-Hwang Scheme......................8
第2.2.1節 方法介紹.................................9
第2.2.2節 弱點分析................................14
第2.3節 簡述Hwang-Yeh Scheme........................18
第2.3.1節 方法介紹................................18
第2.3.2節 弱點分析................................25
第2.4節 簡述Lin-Hwang Scheme........................26
第2.4.1節 方法介紹................................27
第2.4.2節 弱點分析................................33
第2.5節 簡述Yang-Chang-Li-Hwang Scheme..............34
第2.5.1節 方法介紹................................34
第2.5.2節 弱點分析................................40
第3章 遠端身份鑑別機制之研究..........................42
第4章 安全性分析......................................49
第4.1節 通行碼猜測攻擊(password guessing attack.....49
第4.2節 偽裝伺服器攻擊(server spoofing).............49
第4.3節 通行碼驗證資訊遭竊後之攻擊(stolen-verifier attack)................................................50
第4.4節 重送攻擊(replay attack).....................50
第4.5節 阻斷服務攻擊(denial of service attack)......51
第4.6節 會議金鑰安全(session-key security)..........51
第4.7節 已知金鑰安全(known-key security)............51
第4.8節 先前的保密(forward secrecy).................52
第4.9節 論證會議金鑰鑑別功能........................52
第4.9.1節 BAN Logic簡介...........................53
第4.9.2節 論證鑑別功能............................55
第5章 效能與安全性比較................................61
第5.1節 效能比較....................................61
第5.2節 安全性比較..................................64
第6章 結論與未來研究方向..............................66
參考文獻...............................................67
英文論文稿.............................................69學號: 692190050, 學年度: 9
Avant-garde between east and west: Modern architecture and town-planning in the Urals 1920-30
No full textOn hearing the term "Soviet modernism", images of Moscow and Leningrad spring to mind. These two cities may compete with each other for the title of the Russian modernist paradigm. Meanwhile little attention has been paid to the developments in more remote areas of Russia. Apparently, the Ural region played a remarkable role in the history of Soviet avant-garde architecture. Without a clear picture of the developments in the Urals, our knowledge of the Soviet modernism is not complete. Within the framework of the state programme of socialist industrialisation, Soviet and Western modernists implemented in the Urals a number of innovative town-planning concepts, such as decentralization of big cities by building satellite towns. Development of cities, industrial sites and settling systems was carried out with consideration of geographical, climatic, economical and other characteristic features of the location. The Urals cities, therefore, represent a unique complex, which fully demonstrates conceptual regularities of modernist town-planning, placed into regional context. In the 1920-30s, Sverdlovsk, the capital of the Ural region, was a major regional centre of architectural and town-planning activities. It was closely connected with the vanguard "headquarters" in Moscow and Leningrad. Today this city (renamed into Ekaterinburg) possesses an extensive collection of modernist monuments that deserves a close attention of specialists.Architectur
Vinylacetaat monomeer produktie door carbonylering
No full textDocument uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
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