WLAN集成安全模型

Ondiwa Nashon Odhiambo, 1]E. Biermann, G. Noel
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引用次数: 11

摘要

IEEE802.11无线局域网(WLAN)作为企业有线局域网基础设施的扩展被广泛部署。将WLAN作为计算基础设施的一部分意味着更多的关键信息和数据通过空中传输。自从无线网络广播通信量以来,入侵和拒绝服务的威胁是真实存在的。IEEE 802.11定义了WEP、WPA和WPA2安全协议作为可能的对策。WPA2是由IEEE定义的最新模型,它强调数据机密性、完整性和身份验证,但很少关注可用性问题。WPA2中的管理和控制帧仍然是清晰发送的,这使得该模型容易受到DoS攻击。故障恢复过程需要重新认证和重新关联,这使得该模型很容易被各种DoS攻击利用。WPA2定义了一个混合网络,它将WEP和TKIP与WPA2一起实现,这会产生一个被称为安全级别回滚攻击的漏洞,从而使WPA2中强大的机密性和完整性措施与WEP一样弱。在本文中,我们提出了一个集成的安全模型(ISM),该模型包含一个drop策略来防御DoS攻击。我们假设使用CCMP提供保密性和完整性,并使用EAP-TTLS/802.11x与RADIUS提供身份验证。我们在OPNET中进行了仿真,结果表明我们的安全模型在保密性、完整性、真实性和可用性方面表现更好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An integrated security model for WLAN
IEEE802.11 wireless local Area Networks (WLAN) are widely deployed as extension to corporate wired LAN infrastructures. The implication of including WLAN as part of the computing infrastructure means more critical information and data is carried over the air. The threats of intrusion and denial of service is real since wireless networks have broadcasted traffic. IEEE 802.11 defines WEP, WPA and WPA2 security protocols as possible countermeasures. The most recent model defined by IEEE, the WPA2 emphasizes data confidentiality, integrity and authentication but pays little attention to availability issues. Management and control frames in WPA2 are still sent in clear making the model vulnerable to DoS attacks. The failure recovery processes requires reauthentication and reassociation a fact which makes the model easily exploited by various DoS attacks. WPA2, defines a hybrid network that implements both WEP and TKIP together with WPA2 which creates a vulnerability called security level roll back attack thus making the strong confidentiality and Integrity measures in WPA2 be as weak as WEP. In this paper, we propose an integrated security model (ISM) that incorporates a drop policy to defend against DoS attacks. We assume the use CCMP to provide Confidentiality and Integrity and use EAP-TTLS/802.11x with RADIUS to provide authentication. We use simulation in OPNET to show that our security model performs better to provide improved security in terms of confidentiality, integrity, authenticity and availability.
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