论文摘要
分布式拒绝服务(Distributed Denial of Service, DDoS)攻击是目前互联网上最严重的安全问题之一,随着黑客数量和攻击工具的增加使得防御问题更加棘手。由于互联网上存在大量的不安全机器、自动化的DDoS攻击工具非常容易获得以及攻击者采用假冒的IP地址等因素,导致对DDoS攻击的防御和追踪相当困难。就部队而言,在信息化战争中,随着电子信息技术的迅猛发展,信息对抗已经由从属地位逐渐上升到主导地位,谁掌握了制信息权,谁就掌握了整个战争的主动权,从而影响战争的胜败。近来很多DDoS攻击采用TCP SYN Flood攻击方式,本文首先对DDoS攻击特点进行了分析,然后深入研究DDoS攻击中比较棘手的TCP SYN Flood攻击方式。通过对SYN Flood攻击机制、攻击方法、攻击加强技术及现有的防御和追踪方法的研究后,有针对性地提出了基于图灵测试访问控制的防御新方法。采用加权滑动平均方法计算丢弃概率来避免突发流,速率限制采用指数增长的响应方式。SYN Flood攻击主要目的是通过发送大量的SYN请求来耗尽服务器的CPU资源和内存,引起服务器重启。因此该方案从节省资源入手,在服务器分配资源前进行图灵验证,如果发现是非法请求,直接断掉该连接,因此不会为SYN请求分配过多的资源,只需要维护极少的数据即可。本文选择Netfilter做为主要实现框架,利用链接跟踪模块和IP Inspect功能获得相应的数据报信息,并对数据报做适当的处理。最后,对本文对所提出的方案进行了理论分析和模拟实验,结果表明基于图灵测试访问控制机制的方案是有效的、可行的。
论文目录
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标签:分布式拒绝服务攻击论文; 洪水攻击论文; 图灵测试论文; 框架论文;