Intrusion Detection for Wardriving in Wireless Network

为了对无线网络进行入侵检测,设计并实现了无线网络安全监控系统.利用Libpcap函数对无线传输的原始包进行捕获;根据IEEE802.11MAC层协议,对原始包进行协议解码;利用统计分析检测方法,对基于主动扫描的Wardriving入侵进行检测.测试结果表明,该系统能及时发现Wardriving入侵.A wireless network security monitoring system is designed to implement intrusion detection in wireless network. Raw packets of wireless transmission are captured using Libpcap functions and decoded based on IEEE 802.11 MAC layer protocol. Wardriving intrusion based on active scanning is detected using statistic analysis method. Test results show that the system can detect Wardriving intrusion in time.国家部委基金资助项目(5J1400B006

基于GPU的MD5高速解密算法的实现

MD5快速碰撞算法由于不支持逆向过程而无法在MD5密码攻击中得到实际应用。针对上述问题,通过分析基于图形处理单元(GPU)的MD5密码并行攻击算法原理,设计基于GPU的MD5高速解密算法,在此基础上实现一个MD5高速密码攻击系统。测试结果证明,该算法能有效加快MD5密码破解速度

DoS attack based on IEEE 802.11 authentication protocol

对IEEE802. 11认证协议的漏洞和无线网络受到的拒绝服务 (DoS)攻击进行了深入的剖析。捕获并分析IEEE802. 11MAC帧,利用序列号分析的方法,对授权的合法客户受到的DoS攻击进行检测;利用统计分析方法,对访问接入点AP受到的DoS攻击进行检测。Vulnerability in IEEE 802.11 authentication protocol and Denial of Service (DoS) attacks against wireless network were anatomized. IEEE 802.11 MAC frames were captured and analysed. DoS attacks against authorized legitimate clients were detected by sequence number analysis method. DoS attacks against access points were detected by statistic analysis method

The Wireless Intrusion Detection System Based on Data Link Layer

由于无线传输的固有特性及IEEE802.11标准的安全漏洞,无线网络很容易受到攻击,而传统的入侵检测系统在用于无线网络时具有很大的局限性。针对无线攻击的特殊性,提出并实现了一个无线入侵检测系统。该系统在LINUX操作系统下运行,对无线传输的原始数据进行捕获,并根据IEEE802.11MAC层的特性,对无线传输进行分析,从而对WARDRIVING入侵、非法AP、DOS攻击及MAC地址欺骗等攻击行为进行检测。测试结果表明,该系统对无线网络入侵能进行有效的检测和监控。采用该系统并加上其它安全策略,可对无线局域网的安全提供基本的保障。 Wireless network is prone to attacks due to the inherited characteristics and security vulnerabilities of IEEE 802.11 standard. The traditional intrusion detection systems are limited when they are used in wireless network. Aiming at the particularity of wireless attacks, a distributed wireless intrusion detection system is introduced and implemented. The system is running on Linux. Raw packets of wireless transmission are captured and analyzed according to the specialties of IEEE 802.11 MAC layer. Then the attacks of Wardriving intrusion, rogue AP, DoS attack and MAC address spoofing are detected. Testing results show that the system can detect and monitor wireless network effectively. The system can provide a basic safeguard along with other security strategies.厦门市科技局项目(3502Z20021021

IEEE 802.11 Access Control and MAC Address Spoofing

对无线网络的访问控制机制进行了讨论,分析了目前所采用的IEEE802.11B无线网络设备在访问控制方面的不完善性,以及MAC地址访问控制的漏洞。采用序列号分析法对MAC地址欺骗进行检测,从而对无线网络的非授权访问进行监控。Access control mechanism on wireless network is discussed. Faultiness of wireless network equipment adopted presently and flaw of MAC address access control are analysed. MAC address spoofing is detected using sequence number analysis method and unauthenticated access on wireless network is monitored.厦门市科技局项目(3502Z20021021

短信息在图书查询中的应用设计

介绍了短信息服务及其在图书馆查书系统中的应用技术,论述该系统的功能及在系统中采用MFC多线程及动态链接库的实现方法

Decision Method with Lower Level Group Decision Makers Based on SatisFactoriness

本文针对一类下层决策人分组的两层决策问题，建立了其数学模型和决策机制，随后提出了一种决策方法。该决策方法为这一类两层决策问题提供了一种求解途径。篒n view of a kind of bilevel decision making problem in which the lower一level deciSion makers are grouped，the mathematical model and decision mechanism are established．Then a decision making method is proposed，which provides a way to bilevel deci-sion making problem of this kind。国家自然科学基

Genetic variation in three farmed Plectorhinchus cinctus stocks with various body color using AFLP analysis

通过AFLP技术对中国东南沿海的3个不同体色花尾胡椒鲷(Plectorhinchus cinctus)养殖群体进行了遗传分析。6对引物组合从3个群体中扩增出370个位点,其中多态位点比例为49.5%,每对引物组合扩增的片段为51~71条,平均61.3条,每对引物组合多态位点检出率为39.4%~56.5%。正常群体、白色和灰色变异群体的多态位点比例分别为41.4%、36.3%、34.3%,平均杂合度分别为0.1145、0.0887和0.0837。遗传多样性衡量指标表明,正常花尾胡椒鲷养殖群体的遗传变异量相对最大,遗传多样性相对较高,白色变异群体次之,而灰色变异群体最低,白色变异群体和灰色变异群体两者间遗传多样性差异并不显著(P>0.05),显示变异群体的遗传多样性降低。正常群体与白色群体之间的遗传距离(0.0354)最大,遗传相似系数最小(0.9652)。同时,遗传分化系数Fst(0.1362)和AMOVA方差分量百分比(10.68%)也表明群体间存在着一定程度的遗传结构分化,说明对体色这一特定表型性状的人为定向选育对花尾胡椒鲷养殖群体的遗传变异产生一定的影响。Yellow-spotted grunt Plectorhinchus cinctus is a commercially important marine fish cultured in both southeast coast and Taiwan Province of China. At present,the technology on mass seed production and grow-out in a large scale are well established for this species in these areas. During the period of artificial breeding,the stock of morphs with white body and black eyes appeared in normal stock first,and then grey-morph stock differentiated from white stock. In order to assess genetic variation in these different Plectorhinchus cinctus stocks with different body color,to investigate their genetic structure,to evaluate the impact of artificial breeding on their genetic diversity and provide a baseline for further study of genetic breeding and population evolution as well,a total of 90 yellow-spotted grunt were collected from three different localities in both Fujian and Guangdong Provinces in 2004. Among them,12 randomly sampled fish from each stock were used for genomic DNA isolation,and then the amplified fragment length polymorphic (AFLP) technique was employed to analyze genomic DNA polymorphism. The results showed that a total of 370 DNA amplification bands ranging from 100 to 900 bp were produced using 6 pairs of primer combinations selected for the three stocks,including EcoRI-ACC/MseI-CAG,EcoRI-ACC/MseI-CTC,EcoRI-ACC/MseI-CAC,EcoRI-ACT/MseI-CTC,EcoRI-AAC/MseI-CAT and EcoRI-AAC/MseI-CAC,of which 183 were polymorphic and the proportion of polymorphic loci was 49.5%. The amplified bands ranged from 51 to 57 with an average of 61.3 for each primer combination,and the detecting rate of each primer varied from 39.4% to 56.5%. These 6 primer combinations yielded 353 bands,317 bands and 327 bands,respectively,with 146,115 and 112 polymorphic loci for normal,white morph and grey morph stocks. Percent polymorphic loci of 41.4%,36.3% and 34.3% and average heterozygosity of 0.114 5,0.088 7 and 0.083 7 were determined in normal stock,white morph stock and grey morph stock respectively,which clearly showed the trend in the reduction of genetic diversity in morph stocks in comparisons with normal stock. The maximum genetic distance(0.035 4)was also detected between normal and white morph stocks with minimum genetic coefficient(0.965 2). At the same time,genetic division coefficient Fst(0.136 2)and percent variance component of AMOVA(10.68%)also indicated that some genetic differentiation occurred in these three stocks. There existed a certain genetic structure differenciation among them,but there was still more genetic divergence within the stocks than that between the stocks. Either NJ cluster analysis or UPGMA cluster analysis classified normal stock and grey stock into the same category,and white stock was another cluster. It is concluded that genetic divergence is higher in normal stock than that in white or grey stock;the former has rich genetic diversity and grey stock possesses low genetic divergence and diversity compared with the two others. Selective breeding in terms of body color as a specifically phenotypic trait has some impacts on genetic variation of farmed stocks of P. cinctus. However,due to a comparatively short time of isolation in each stock,there has been no significant genetic difference between them so far(P>0.05).福建省海洋与渔业局重点项目(闽渔科0371)

Potentiality Analysis of Grain Productivity and Its Security in Changwu County in the Loess Plateau Gully Region against the Background of "Grain for Green" Projection

鉴于黄土高塬沟壑区退耕还林(草)工程和林果业迅速发展所带来的粮食-人口-资源矛盾问题,收集农业气象、耕地等数据,基于GIS技术,采用机制法分析了退耕还林(草)工程实施前后的1993年和2009年黄土高塬沟壑区长武县粮食潜力和安全问题,明确了气候要素限制下长武县各层次粮食生产潜力及开发程度。长武县1993年到2009年可实现粮食潜力总量下降了7.8%,而实际粮食生产总量增产了4.0%,潜力实现率由61.58%增至68.59%。17a间,主要粮食作物播种面积减少了27.8%,单产平均提高44.1%,而人口增长了12.5%,人均播种面积下降了35.9%,人均粮食产量由320.1kg减少至296.0kg,下降了7.5%。温度和土地有效系数的提高是促进可实现粮食潜力增加的主要因素,耕地减少是限制粮食增幅的直接原因,单产提高是促进增产的主要因素。耕地减少、人口增加是该区粮食安全的核心问题,粮食单产的提高是维持该区粮食安全稳定的保障。针对该区粮食安全问题的严峻性,提出必须以全面提高粮食单产为目标,科学增加辅助能量投入,推进基本农田建设,大力推广耕地保育技术和持续高效现代农业