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信息技术留学thesis范文 [6]

论文作者:www.51lunwen.org论文属性:本科毕业论文 Thesis登出时间:2014-08-24编辑:felicia点击率:17425

论文字数:6361论文编号:org201408190858459958语种:英语 English地区:中国价格:免费论文

关键词:无线网络信息技术wireless networkscomputing servicesAd-hoc networks

摘要:本文是一篇信息技术留学论文。随着当前技术的不断进步,无线网络越来越普及。这些网站让用户可以“自由旅行”,从一个地方到另一个地方的过程中可以享受不中断的计算机网络服务。本文以自组网为例,分析无线网络运营的作用和影响。

The widespread availability of inexpensive, easy-to- deploy APs and wireless routers has exacerbated this problem. As mentioned earlier, we found several unsecured APs in large organizations. The DAIR security management system can detect both rogue APs and rogue ad-hoc networks. Another way a corporate network can be compromised is when an attacker obtains the credentials (e.g., WEP passwords, IEEE 802.1x certificates) needed to connect to the corporate network. The DAIR security management system can not currently detect such attacks.


Denial of Service (DoS)

Denial of Service attacks are active attacks. A diversity of DoS attacks are possible. Some DoS attacks exploit flaws in the IEEE 802.11 protocol. For example, a disassociation attack is where the attacker sends a series of fake disassociation or deauthentication messages, causing legitimate clients to disconnect from the AP. In a NAV attack, the attacker generates packets with large duration values in the frame header, thereby forcing legiti- mate clients to wait for long periods of time before accessing the network . In a DIFS attack, the attacker exploits certain timing- related features in the IEEE 802.11 protocol to aggressively steal bandwidth from legitimate users. 


In all three cases, the attacker transmits packets in an abnormal way, either by generating non-compliant packets, or by transmitting compliant packets at an abnormally high rate. The DAIR security management system can detect such attacks. DoS attacks are also possible by creating large amount of RF noise in the neighborhood of the network. The DAIR security management system can detect such attacks by comparing current observations with historical data observed from multiple vantage points. DoS attacks can also be mounted by gaining access to the corporate wired network and attacking the APs from the wired side. The DAIR system does not handle DoS attacks on the wired network.


Phishing

Phishing is an active attack. An attacker sets up a wireless AP that masquerades as a legitimate corporate AP (same SSID, per- haps even same BSSIDs). If the client does not use mutual authentication, it is possible for the attacker to lure unsuspecting legiti- mate users to connect to its AP. The attacker can then use a variety of techniques to extract private information (for example, sniff for passwords). The DAIR system can detect phishing attacks. How- ever, we do not describe solutions to phishing attacks in this paper.


ACTIVE ATTACKS SECURITY ATTACKS

Certain active attacks can be easily performed alongside an ad -hoc network. Understanding possible shape of attacks is for all time the first step towards increasing good safety solutions. Based on this danger analysis and the recognized capabilities of the potential attackers, several well recognized attacks that can target the operation of a routing protocol in an ad hoc network are discussed.


Impersonation. In this kind of attack, nodes may be clever to join the network untraceable or can able to send the false routing data/informat论文英语论文网提供整理,提供论文代写英语论文代写代写论文代写英语论文代写留学生论文代写英文论文留学生论文代写相关核心关键词搜索。

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