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Secure multiparty computation has become a central research focus in the international cryptographic community and in the future likely will represent an integral part of computing science. Protocols for Yao’s millionaires’ problem provide the building blocks for many secure multiparty computation protocols, which makes their efficiency critical. Unfortunately, all known protocols for Yao’s millionaires’ problem employ public key cryptography and thus are inefficient. This article constructs a new efficient solution to Yao’s millionaires’ problem based on symmetric cryptography. We first develop an efficient protocol for set-inclusion problems, which has independent interest for secure multiparty computations. The privacy-preserving property of the solution is demonstrated by a well-accepted simulation paradigm. To compare the security levels of different solutions, we propose a new security paradigm that quantitatively captures the security levels of different solutions and can determine which secure multiparty computation solution is preferable. This article thus provides an important supplement to the simulation paradigm. Together with the simulation paradigm, it offers a complete security evaluation benchmark for multiparty computations. 相似文献
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工程管理专业教育范式的转型策略 总被引:2,自引:0,他引:2
大工程观的提出使得工程管理人才的素质必须符合“理念、人、物、我”四方面的圆融整合要求。受传统科学范式的影响,目前工程管理专业培养的人才已不能适应新形势的需要,教育范式的转换已成为工程管理专业教育的当务之急。在对工程教育的科学范式与工程范式进行辨析的基础上,深入剖析了工程范式的基本特征,强调新形势下工程管理专业教育应采用工程范式,其转型策略为:从教育价值观的重新定位出发,通过课程体系的改革,再辅以校园文化的重建,从而实现工程管理专业教育范式由科学范式向工程范式的转换。 相似文献
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Constantin Filote Raluca-Andreea Felseghi Maria Simona Raboaca Ioan Aşchilean 《国际能源研究杂志》2020,44(13):10471-10494
The Electric Vehicle (EV) as a clean alternative to Classic Vehicle that use fossil fuels is promoted as an immediate solution to improve the quality parameters of the environment related to the transport sector. The transition to clean electrified mobility must be considered from the sustainability spectrum, and the planning of a strategy related to the implementation of electric vehicles implies, from the beginning, providing clean energy conditions to go toward a green-to-green paradigm. It should be noted that the successful implementation of the “green electro mobility” concept depends heavily on the green energy supply solutions of green electric vehicle, so Electric Vehicle Charging Stations (EV-CS) should be powered by electricity generation systems based on green resources. This research article has as main objective the environmental impact assessment from the perspective of CO2 emissions embedded in green stand-alone energy systems and the estimation of the environmental benefits of their implementation in the power supply of EV-CS from the perspective of avoided CO2 emissions compared to the classic electricity supply grid. The results indicate that the green energy systems represent feasible solutions for the independent energy support of electric vehicle charging stations, being able to supply electricity based on on-site available 100% alternative energy sources. Related to 1 kWh of electricity, the CO2 emissions embedded in these systems represent on average 11.40% of the CO2 emissions of the electricity supplied through the grid at European level and on average 7.10% of the CO2 emissions of the electricity supplied through the grid worldwide. Results also show that the average price of 1kWh of electricity generated by the analyzed systems is 4.3 times higher than the average unit price of the European Union grid energy, but this indicator must be correlated with the kgCO2/kWh cost savings compared to the electricity production from classic power plants. 相似文献
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Ouri Wolfson Weining Zhang Harish Butani Akira Kawaguchi Kui Mok 《International journal of parallel programming》1992,21(4):269-302
In this paper we consider parallel processing of a graph represented by a database relation, and we achieved two objectives. First, we propose a methodology for analyzing the speedup of a parallel processing strategy with the purpose of selecting at runtime one of several candidate strategies, depending on the hardware architecture and the input graph. Second, we study the single-source reachability problem, namely the problem of computing the set of nodes reachable from a given node in a directed graph. We propose several parallel strategies for solving this problem, and we analyze their performance using our new methodology. The analysis is confirmed experimentally in a UNIX-Ethernet environment. We also extend the results to the transitive closure problem.A preliminary shortened version of this paper has appeared inPDIS. See Ref. 1.This author's work was supported in part by NSF Grant 90-03341.This author's work was supported in part by the Natural Sciences and Engineering Research Council of Canada.This author's work was supported in part by NSF Grant 90-03341. 相似文献
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分布计算系统的进展与问题 总被引:1,自引:0,他引:1
本文简要叙述了分布计算系统的发展过程、现状和有待解决的问题。 相似文献
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In this paper we present an efficient subquadratic-time algorithm for matching strings and limited expressions in large texts. Limited expressions are a subset of regular expressions that appear often in practice. The generalization from simple strings to limited expressions has a negligible affect on the speed of our algorithm, yet allows much more flexibility. Our algorithm is similar in spirit to that of Masek and Paterson [MP], but it is much faster in practice. Our experiments show a factor of four to five speedup against the algorithms of Sellers [Se] and Ukkonen [Uk1] independent of the sizes of the input strings. Experiments also reveal our algorithm to be faster, in most cases, than a recent improvement by Chang and Lampe [CL2], especially for small alphabet sizes for which it is two to three times faster.The research of U. Manber was supported in part by a Presidential Young Investigator Award DCR-8451397, with matching funds from AT&T, and by NSF Grant CCR-9001619. G. Myers research was supported in part by NIH Grant LM04960, NSF Grant CCR-9001619, and the Aspen Center for Physics. 相似文献