检索结果-南通市图书馆

分组密码算法在x64平台上的软件实现速度测试方法研究

在线全文

学校读者我要写书评

暂无评论

信息安全学报 2024年第3期9卷 59-79页

作者：季福磊张文涛毛颖颖赵雪锋中国科学院信息工程研究所信息安全国家重点实验室北京100093 中国科学院大学网络空间安全学院北京100049 国家密码管理局商用密码检测中心北京100036

密码算法的软件实现速度是衡量其实现性能的重要指标之一。在密码算法的设计和评估工作中,测试密码算法的软件实现速度是一项必不可少的工作。在国内外已有的工作中,关于如何在x64平台上进行密码算法的软件实现速度测试没有形成统一的... 详细信息

密码算法的软件实现速度是衡量其实现性能的重要指标之一。在密码算法的设计和评估工作中,测试密码算法的软件实现速度是一项必不可少的工作。在国内外已有的工作中,关于如何在x64平台上进行密码算法的软件实现速度测试没有形成统一的测试标准。本文以分组密码算法的速度测试为例,研究如何在x64平台上测试密码算法的软件实现速度。首先,我们通过实验分析在x64平台上对密码算法进行软件实现速度测试的过程中容易出现的问题。第二步,我们对目前已有的四种速度测试方法:Matsui速度测试方法,Fog速度测试方法,SUPERCOP速度测试方法和Gladman速度测试方法进行研究,对四种速度测试方法的异同进行比较,分析四种方法中存在的问题。第三步,我们采用理论分析与实验探究相结合的研究方法,研究如何降低速度测试过程中产生的波动性数据对实验结果的影响。我们对速度测试公式选择、样本量选择等问题进行了细致的研究。最终我们给出在x64平台上测试分组密码算法软件实现速度的最小值和平均值的有效方法。应用该方法得到的测试结果是稳定的(测试得到的速度随机性小,结果既不会偏大也不会偏小)、可靠(测试过程取样充分,测试得到的速度是可信的)、高效的(在保证测试结果可靠和稳定的前提下,取样量较小,测试过程耗时较少)。利用本文给出的速度测试方法,我们对AES算法和SM4算法在x64平台上的软件实现速度进行了实际测试。

关键词：密码算法 x64平台软件实现速度测试方法

基于程序约束的细粒度JVM测试程序约简方法

在线全文

学校读者我要写书评

暂无评论

软件学报 2024年第7期35卷 3204-3226页

作者：杜义恒王赞赵英全陈俊洁陈翔侯德俊郑开天津大学智能与计算学部天津300350 南通大学信息科学技术学院江苏南通226019 信息安全国家重点实验室(中国科学院信息工程研究所) 北京100093 天津大学信息与网络中心天津300072

为了对Java虚拟机(JVM)进行测试,开发人员通常需要手工设计或利用测试生成工具生成复杂的测试程序,从而检测JVM中潜在的缺陷.然而,复杂的测试程序给开发人员定位及修复缺陷带来了极高的成本.测试程序约简技术旨在保障测试程序缺陷检测... 详细信息

为了对Java虚拟机(JVM)进行测试,开发人员通常需要手工设计或利用测试生成工具生成复杂的测试程序,从而检测JVM中潜在的缺陷.然而,复杂的测试程序给开发人员定位及修复缺陷带来了极高的成本.测试程序约简技术旨在保障测试程序缺陷检测能力的同时,尽可能地删减测试程序中与缺陷检测无关的代码.现有研究工作基于Delta调试在C程序和XML输入上可以取得较好的约简效果,但是在JVM测试场景中,具有复杂语法和语义依赖关系的Java测试程序约简仍存在粒度较粗、约简效果较差的问题,导致约简后的程序理解成本依然很高.因此,针对具有复杂程序依赖关系的Java测试程序,提出一种基于程序约束的细粒度测试程序约简方法JavaPruner.首先,在语句块级别设计细粒度的代码度量方法;随后,在Delta调试技术上引入语句块之间的依赖约束关系来对测试程序进行约简.以Java字节码测试程序为实验对象,从现有的针对JVM测试的测试程序生成工具中筛选出具有复杂依赖关系的50个测试程序作为基准数据集,并在这些数据集上验证JavaPruner的有效性.实验结果表明,JavaPruner可以有效删减Java字节码测试程序中的冗余代码.与现有方法相比,在所有基准数据集上,约简能力平均可提升37.7%.同时,JavaPruner可以在保障程序有效性及缺陷检测能力的同时,将Java字节码测试程序最大约简至其原有大小的1.09%,有效降低了测试程序的分析和理解成本.

关键词： Java虚拟机 JVM测试测试程序约简 Delta调试

气候变化影响中国东北地区降水侵蚀力的高分辨率区域模式预估

在线全文

学校读者我要写书评

暂无评论

大气科学 2024年第2期48卷 480-496页

作者：辛羽婷张文霞邹立维周天军赵勇成都信息工程大学大气科学学院成都610225 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室北京100029 中国科学院大学地球与行星科学学院北京100049 吉林省吉林市气象局吉林132000

土壤侵蚀是生态环境和农业生产的重要影响因子。我国东三省土地面积79.33万平方公里,占我国国土面积的9.3%,是重要的商品粮基地,同时也是世界四大黑土区之一。在气候变化背景下,我国东北地区的土壤侵蚀情况及其未来风险,目前仍不清楚。... 详细信息

土壤侵蚀是生态环境和农业生产的重要影响因子。我国东三省土地面积79.33万平方公里,占我国国土面积的9.3%,是重要的商品粮基地,同时也是世界四大黑土区之一。在气候变化背景下,我国东北地区的土壤侵蚀情况及其未来风险,目前仍不清楚。影响土壤侵蚀力的重要因素之一是降水侵蚀力(R-factor),其与强降水有关。本研究利用CN05.1和APHRODITE观测降水资料揭示了我国东北地区降水侵蚀力的观测特征。在气候平均态上,东北地区东南部降水侵蚀力最强。降水侵蚀力存在明显的年循环,以夏季为主导,占全年总侵蚀的80%以上。在观测分析基础上,对RegCM4动力降尺度模式进行了评估和订正,并预估了未来不同共享社会经济路径(SSP1-2.6和SSP5-8.5)下中国东北地区降水侵蚀力的变化。随着未来增温,到2.世纪末,两种排放情景下东北地区平均的降水侵蚀力分别增加9.90%和2..70%。高排放情景下将面临更严重的降水侵蚀风险,SSP5-8.5情景下降水侵蚀力的增强幅度约为SSP1-2.6情景下变化的2.7倍,同时77.69%的区域面积上降水侵蚀力将更强。因此,采取切实有效的减排措施,走可持续发展路径,对于减缓我国东北地区黑土地的土壤侵蚀风险,进而保障粮食安全,具有重要意义。

关键词：降水侵蚀动力降尺度气候变化偏差订正

维普期刊数据库博看期刊

A database framework of digital forestry towards sustainable forestry development in china

在线全文

学校读者我要写书评

暂无评论

Science china(Technological sciences) 2006年第z1期49卷 19-26页

作者： zhao Jingzhu WANG Yanchun DONG Rencai state key Lab of Systems Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China State Key Lab of Systems Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China State Key Lab of Systems Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Six forestry scientific and technological projects being actualized in china were the implementations of ecological construction and security, development of forestry biological technique and fine variety cultivation, protection and utilization of forest biological germplasm resources, development of forestry bio-industry and digital forestry, and construction of forestry innovation ability. Among them, digital forestry was an effective measure to improve the ability of forestry innovation, to realize resources sharing, and to develop sustainable forestry. Spatial database of digital forestry should be constructed according to the criteria and index system of forest sustainable management. Based on analyzing the status and advances of china's digital forestry construction, a database framework of digital forestry towards sustainable forestry development was studied and established preparatorily. The database was divided into four layers as theory layer, system layer, status layer, and parameter layer. It was concluded that during the process of digital forestry platform construction, the relative social, economic, and politic data should be considered and collected, which meant that the database should represent not only the current forestry development, but also the social, politic, and economic situations. Constructing china's digital forestry information platform under full utilization of idea and index system for sustainable forest management was urgent and important.

关键词： database framework, digital forestry, sustainable forestry development, forest resources.

Ciphertext-Policy Attribute Based Encryption Supporting Any Monotone Access Structures Without Escrow

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Electronics 2017年第3期26卷 640-646页

作者： zhao Qianqian ZHANG Yuqing ZHANG Guanghua WANG He state key Laboratory of Integrated Services Networks Xidian University National Computer Network Intrusion Protection Center University of Chinese Academy of Sciences beijing key Laboratory of IOT {2. security Technology Institute of Information Engineering CAS

Ciphertext policy attribute-based encryption(CP-ABE)is becoming a new primitive for finegrained access *** neither produces multiple encrypted copies of the same data nor suffers from the severe burden of key distribution and *** escrow problem that the central authority could decrypt any ciphertexts addressed to all the specific users is still a challenge for CP-ABE *** new CP-ABE scheme without escrow is proposed,and furthermore the proposed scheme achieves fully security in the standard *** performance and security analysis results indicate that the proposed CP-ABE scheme is extremely appropriate for cloud storage system.

关键词： CP-ABE The escrow problem Fully security In the standard model

One-way information reconciliation schemes of quantum key distribution

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Cybersecurity 2019年第1期2卷 380-392页

作者： Li Yang Hua Dong zhao Li state key Laboratory of {2. security Institute of Information EngineeringChinese Academy of SciencesBeijing 100093China state key Laboratory of Cryptology P.O.Box 5159Beijing 100878China School of Cyber security University of Chinese Academy of SciencesBeijing 100049China

With the rapid improvement of quantum computing technology,quantum key distribution(QKD)is a hot *** reconciliation is a key step of QKD which is useful for correcting key *** message interaction is necessary in a practical information reconciliation scheme,which makes the efficiency of these protocols ***,some one-way information reconciliation schemes based on low-density parity-check(LDPC)codes and polar codes are *** we propose a concatenated method of IR schemes which can achieve any given error rate level without the need of *** with the one-way IR schems based on LDPC codes and polar codes,the IR schemes based on the proposed concatenated method can get lower bit error rates after error correction,which can also reduce the communication delay and system complexity of QKD,improve the final key generation rate and enhance the practicability of QKD system.

关键词： Quantum key distribution information reconciliation Concatenated scheme One-way communication

key-insulated aggregate signature

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2014年第5期8卷 837-846页

作者： Huiyan zhao Jia YU Shaoxia DUAN Xiangguo CHENG Rong HAO College of information Engineering Qingdao University Qingdao 266071 China Shandong Provincial key Laboratory of Computer Network Jinan 250014 China state key Laboratory of {2. security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China

In order to minimize the damage caused by key exposure in aggregate signatures, a key-insulated aggregate signature scheme is proposed in this paper. We give the def- inition and the {2. model of the key-insulated aggregate signature. We also construct a concrete key-insulated aggre- gate signature scheme that meets our definition. Our scheme has the properties of efficient verification and short signature length. We prove the {2. of our scheme in the random oracle model under the computation Diffie-Hellman assump- tion.

关键词： aggregate signature key-insulated aggregatesignature provable security bilinear pairings

Energy-Efficient UAV Trajectory Design for Backscatter Communication: A Deep Reinforcement Learning Approach

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

china Communications 2020年第10期17卷 129-141页

作者： Yiwen Nie Junhui zhao Jun Liu Jing Jiang Ruijin Ding School of Electronic and information Engineering Beijing Jioatong UniversityBeijing 100044China School of information Engineering East China Jiaotong UniversityNanchang 330013China Institute of Network sciences and Cyberspace Tsinghua UniversityBeijing 100084China beijing National Research Center for information Science and Technology(BNRist) Beijing 100084China Shaanxi key Laboratory of information Communication Network and {2. Xi’an University of Posts and TelecommunicationsXi’an 710121China Institute for Artificial Intelligence Tsinghua University(THUAI)Beijing 100084China state key Laboratory of Intelligent Technologies and Systems Tsinghua UniversityBeijing 100084China beijing National Research Center for information Science and Technology(BNRist) Department of AutomationTsinghua UniversityBeijing 100084China

Recently,backscatter communication(BC)has been introduced as a green paradigm for Internet of Things(IoT).Meanwhile,unmanned aerial vehicles(UAVs)can serve as aerial base stations(BSs)to enhance the performance of BC system thanks to their high mobility and *** this paper,we investigate the problem of energy efficiency(EE)for an energy-limited backscatter communication(BC)network,where backscatter devices(BDs)on the ground harvest energy from the wireless signal of a flying rotary-wing ***,we first reformulate the EE optimization problem as a Markov decision process(MDP)and then propose a deep reinforcement learning(DRL)algorithm to design the UAV trajectory with the constraints of the BD scheduling,the power reflection coefficients,the transmission power,and the fairness among *** results show the proposed DRL algorithm achieves close-to-optimal performance and significant EE gains compared to the benchmark schemes.

关键词： unmanned aerial vehicle(UAV) trajectory design backscatter communication deep reinforcement learning energy-efficient

Image editing by object-aware optimal boundary searching and mixed-domain composition

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2018年第1期4卷 71-82页

作者： Shiming Ge Xin Jin Qiting Ye zhao Luo Qiang Li Institute of information Engineering ChineseAcademy of SciencesBeijing 100095China beijing Electronic Science and Technology Institute Beijing 100070China School of Cyber security University of Chinese Academyof SciencesBeijingChina School of information Engineering Southwest Universityof Science and TechnologyMianyang 621010China

When combining very different images which often contain complex objects and backgrounds,producing consistent compositions is a challenging problem requiring seamless image editing. In this paper, we propose a general approach, called objectaware image editing, to obtain consistency in structure,color, and texture in a unified way. Our approach improves upon previous gradient-domain composition in three ways. Firstly, we introduce an iterative optimization algorithm to minimize mismatches on the boundaries when the target region contains multiple objects of interest. Secondly, we propose a mixeddomain consistency metric for measuring gradients and colors, and formulate composition as a unified minimization problem that can be solved with a sparse linear system. In particular, we encode texture consistency using a patch-based approach without searching and matching. Thirdly, we adopt an objectaware approach to separately manipulate the guidance gradient fields for objects of interest and backgrounds of interest, which facilitates a variety of seamless image editing applications. Our unified method outperforms previous state-of-the-art methods in preserving global texture consistency in addition to local structure continuity.

关键词： seamless image editing patch-based synthesis image composition mixed-domain gradient-domain composition