1,155 research outputs found
Hans L. Merkle. Reden bei der Festveranstaltung aus Anlaß der Ernennung von Prof. Dr. h. c. Hans L. Merkle zum Ehrenbürger der Universität Stuttgart 4. Februar 1994
No full textAm 4. Februar 1994 erneuerte die Universität Stuttgart eine Tradition, die seit den sechziger Jahren geruht hatte: sie beschloß, einzelne Persönlichkeiten mit hohem Vorbildcharakter wieder zum Ehrenbürger der Universität Stuttgart zu ernennen. Daß die Erneuerung dieser Tradition durch die Ernennung von Professor Dr. h. c. Hans L. Merkle zum Ehrenbürger mit einer anderen Tradition, der langjährigen Verbundenheit der Universität Stuttgart mit der Firma Bosch, im Einklang stand, war für die Universität ein gewollter Glücksfall. Früherer Ehrenbürger der Universität war auch Hans Walz, Merkles Vorgänger im Hause Bosch gewesen. Der Ehrenbürger ist herausragendes Mitglied einer civitas. Die traditionelle Beziehung zwischen Wissenschaftund Industrie, Universität und Bosch, wird durch Professor Merkle symbolisiert und verallgemeinert. Diesem Gedanken trug auch Professor Rolf Hempel, Rektor der Hochschule für Musik und Darstellende Kunst, Rechnung, als er der Universität Stuttgart gestattete, die Festveranstaltung im Wilhelma-Theater auszurichten. Die Universität Stuttgart weiß ihm dafür Dank. Ebenso dankt sie dem ehemaligen bayerischen Kultusminister Professor Dr. Hans Maier für seinen Festvortrag. „Eine Kultur oder viele? Die Zukunft der Kulturen“ war ein Thema, das dem zu Ehrenden entsprach. Die Warnung vor einem weltweit verbreiteten separatistischen Multikulturalismus, verbunden mit dem Aufruf an Europa, nach einer kritischen Selbstprüfung seine Rolle in der Welt neu zu definieren, diese aber auch anzunehmen, stieß in der Person des neuen Ehrenbürgers der Universität Stuttgart auf einen entsprechenden Weltbürger
Characterisation of an Arabidopsis thaliana homologue of the nuclear export receptor CAS by its interaction with Importin alpha.
No full textHaasen D, Merkle T. Characterisation of an Arabidopsis thaliana homologue of the nuclear export receptor CAS by its interaction with Importin alpha. Plant Biology. 2002;4:432-439
Characterization of membrane-bound small GTP-binding proteins from Nicotiana tabacum
No full textHaizel T, Merkle T, Turck F, Nagy F. Characterization of membrane-bound small GTP-binding proteins from Nicotiana tabacum. Plant Physiology. 1995;108(1):59-67
Comprehensive prediction of novel microRNA targets in Arabidopsis thaliana
No full textAlves jun. L, Niemeier S, Hauenschild A, Rehmsmeier M, Merkle T. Comprehensive prediction of novel microRNA targets in Arabidopsis thaliana. Nucleic Acids Research. 2009;37(12):4010-4021
Random Oracle Combiners: Merkle-Damgård Style
No full textA Random Oracle Combiner (ROC), introduced by Dodis et al. (CRYPTO ’22), takes two hash functions from m bits to n bits and outputs a new hash function from \u27 to \u27 bits. This function C is guaranteed to be indifferentiable from a fresh random oracle as long as one of and (say, ) is a random oracle, while the other h2 can “arbitrarily depend” on .
The work of Dodis et al. also built the first length-preserving ROC, where ′ = . Unfortunately, despite this feasibility result, this construction has several deficiencies. From the practical perspective, it could not be directly applied to existing Merkle-Damgård-based hash
functions, such as SHA2 or SHA3. From the theoretical perspective, it required and to have input length > 3λ, where λ is the security parameter.
To overcome these limitations, Dodis et al. conjectured — and left as the main open question — that the following (salted) construction is a length-preserving ROC:
where are random salts of appropriate length, and denotes the Merkle-Damgård-extension of a given compression function . As our main result, we resolve this conjecture in the affirmative. For practical use, this makes the resulting combiner applicable to existing, Merkle-Damgård-based hash functions. On the theory side, it shows the existence of ROCs only requiring optimal input length = λ+O(1)
Signature based Merkle Hash Multiplication algorithm to secure the communication in IoT devices
No full textSignature based Merkle Hash Multiplication algorithm to secure the communication in IoT device
Merkle–Damgård revisited: How to construct a hash function
No full textThe most common way of constructing a hash function (e.g., SHA-1) is to iterate a compression function on the input message. The compression function is usually designed from scratch or made out of a block-cipher. In this paper, we introduce a new security notion for hash-functions, stronger than collision-resistance. Under this notion, the arbitrary length hash function H must behave as a random oracle when the fixed-length building block is viewed as a random oracle or an ideal block-cipher. The key property is that if a particular construction meets this definition, then any cryptosystem proven secure assuming H is a random oracle remains secure if one plugs in this construction (still assuming that the underlying fixed-length primitive is ideal). In this paper, we show that the current design principle behind hash functions such as SHA-1 and MD5 — the (strengthened) Merkle–Damgård transformation — does not satisfy this security notion. We provide several constructions that provably satisfy this notion; those new constructions introduce minimal changes to the plain Merkle–Damgård construction and are easily implementable in practice
Improvement of the design and generation of highly specific plant knockdown lines using primary synthetic microRNAs (pri-smiRNAs)
No full textNiemeier S, Alves jun. L, Merkle T. Improvement of the design and generation of highly specific plant knockdown lines using primary synthetic microRNAs (pri-smiRNAs). BMC Research Notes. 2010;3(1): 59.Background:
microRNAs (miRNAs) are endogenous small non-coding RNAs that post-transcriptionally regulate gene expression. In plants, they typically show high complementarity to a single sequence motif within their target mRNAs and act by catalyzing specific mRNA cleavage and degradation. miRNAs are processed from much longer primary transcripts via precursor miRNAs containing fold-back structures. Leaving these secondary structures intact, miRNAs can be re-designed experimentally to target mRNAs of choice.
Results:
We designed primary synthetic miRNAs (pri-smiRNAs) on the basis of the primary transcript of the Arabidopsis MIR159A gene by replacing the original miR159a and the corresponding miR159a* with novel sequences, keeping the overall secondary structure as predicted by the program RNAfold. We used the program RNAhybrid to optimize smiRNA design and to screen the complete Arabidopsis transcriptome for potential off-targets. To improve the molecular cloning of the pri-smiRNA we inserted restriction sites in the original MIR159A primary transcript to easily accommodate the smiRNA/smiRNA* DNA fragment. As a proof-of-concept, we targeted the single gene encoding chalcone synthase (CHS) in Arabidopsis. We demonstrate smiRNA(CHS) expression and CHS mRNA cleavage in different transgenic lines. Phenotypic changes in these lines were observed for seed color and flavonol derivatives, and quantified with respect to anthocyanin content. We also tested the effect of mismatches and excess G:U base pairs on knockdown efficiency.
Conclusions:
RNAhybrid-assisted design of smiRNAs and generation of pri-smiRNAs using a novel vector containing restriction sites greatly improves specificity and speed of the generation of stable knockdown lines for functional analyses in plants
Public auditing with dynamic integrity for cloud storage
No full text碩士雲端儲存資料外包(outsourced)是雲端運算的服務項目中最為普遍且成熟的項目，但如何確保存放於雲端的資料的完整性(integrity)與正確性(correctness)卻是此應用推廣必須積極面對的課題。委由一個可信的第三方稽核者(Third Party Auditor)對雲端儲存資料進行稽核(auditing)機制，因其不增加使用者的負擔並同時顧及使用者的隱私(privacy)保護故是具體有效的解決方案，然而檔案資料龐大且有必須顧及資料私密性，採行Merkle hash tree予以輔助是目前常見的有效率作法，但由於使用者對檔案區塊的修正、插入與刪除等動態操作，僅直接採行Merkle hash tree依然造成整體稽核機制效能不彰，本論文提出採用Merkle hash tree的雲端儲存稽核機制在動態操作過程Merkle hash tree中子樹調整基準與進行重建之方法，使稽核機制稽核過程不僅能夠保護使用者資料，更能充分提供使用者對檔案進行有效率的動態操作，但卻不會如原來因直接採行Merkle hash tree而造成通訊成本以及使用者和稽核者計算成本增加的弱點。本論文方法適合於各種採行Merkle hash tree之稽核機制在不影響其原來稽核功能及安全性前提下，使其有效率地提供動態操作功能並增強其實用性。Outsourcing data to cloud storage is one of the most common and mature application of all kinds of cloud services. How to verify the integrity and correctness of the user’s data in the cloud storage is a really serious problem in the cloud-based application. The general solution is to authorize a trusted third party auditor to audit the data in the cloud storage from time to time. It will be a concrete and efficient solution, if it makes no additional burden to the user and takes the user''s privacy into consideration at the same time. Because of lots of data files in the cloud storage, many solutions use Merkle hash tree technique to enhance the efficiency and guaranteeing the privacy. Merkle hash tree of each data file will be askew after performing many dynamic data operations such as inserting or deleting of data block. The performances of many cloud storage public auditing schemes based on Merkle hash tree are poor by this case. The paper proposes an efficiency method to adjust Merkle hash tree in the dynamic data operation. The proposed scheme can be embedded into any cloud storage public auditing scheme based on Merkle hash tree technique. The public auditing scheme includes the proposed method will provide the dynamic operations efficiently without losing the privacy-preserving functionality.目錄
第一章 前言 1
第二章 相關研究 5
2.1 技術簡介 5
2.2 Wang等學者方法[3]簡介 10
2.3 分析與討論Wang等學者方法[3]動態操作方法 15
第三章 論文方法 17
3.1 插入區塊 17
3.2 插入區塊 23
第四章 討論與分析 27
4.1 插入區塊之正確性分析 27
4.2 刪除區塊之正確性分析 28
4.3 動態操作效能分析 30
4.4 其他安全性分析 31
第五章 結論 33
參考文獻 34
附錄：英文論文 36
圖目錄
圖2-1：Merkle Hash Tree(當節點個數為偶數) 7
圖2-2：Merkle Hash Tree(當節點個數為奇數) 7
圖2-3：對應於檔案F之Merkle Hash Tree MHT 12
圖2-4：基本完整性驗證之通訊協定 13
圖2-5：將節點h(bi)以h(bi*)取代 14
圖3-1：在節點h(bi)後方插入節點h(b′) 18
圖3-2：MHT之初始狀態 19
圖3-3：在節點h(b3)後方插入節點h(b3′) 20
圖3-4：在節點h(b3)後方插入節點h(b3′′) 20
圖3-5：重建Merkle Hash Tree 之子樹MHT′D 21
圖3-6：在完成插入節點h(b3′)前之Merkle Hash Tree 21
圖3-7：完成插入節點h(b3′′)後之MHT′ 22
圖3-8：MHT刪除h(bi) 24
圖4-1：Merkle Hash Tree MHT 27
圖4-2：插入區塊操作後的Merkle Hash Tree MHT′ 28
圖4-3：刪除區塊操作後的Merkle Hash Tree MHT′ 29
表目錄
表2-1：本論文之符號定義 9學號: 699410527, 學年度: 10
Heschel\u27s Attitude toward Religious Pluralism
No full textBook’s Table of Contents: Foreword / Johannes Cardinal Willebrands; Foreword / Jerzy Kosinski; Preface / Harold Kasimow; Preface / Byron L. Sherwin; No religion is an island / Abraham Joshua Heschel; My father / H. Susannah Heschel; My master / Byron L. Sherwin; My teacher / Jacob Y. Teshima; My friend / Daniel Berrigan; Heschel\u27s prophetic vision of religious pluralism / Harold Kasimow; Heschel\u27s attitude toward religious pluralism / John C. Merkle; Heschel\u27s impact on Catholic-Jewish relations / Eugene J. Fisher; Heschel\u27s significance for Protestants / John C. Bennett; Christian pietism and Abraham Heschel / Fredrick C. Holmgren; Muslim\u27s dialogue with Abraham Joshua Heschel / Riffat Hassan; Hindu-Jewish dialogue and the thought of Abraham Heschel: at grassroots and mountaintop / Arvind Sharma; Asian perspective: the novelty of Heschel\u27s views on interreligious dialogue / Antony Fernando; Heschel\u27s passion for justice / Kenneth B. Smith
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