19,165 research outputs found
Security and Privacy Issues in Wireless Mesh Networks: A Survey
This book chapter identifies various security threats in wireless mesh
network (WMN). Keeping in mind the critical requirement of security and user
privacy in WMNs, this chapter provides a comprehensive overview of various
possible attacks on different layers of the communication protocol stack for
WMNs and their corresponding defense mechanisms. First, it identifies the
security vulnerabilities in the physical, link, network, transport, application
layers. Furthermore, various possible attacks on the key management protocols,
user authentication and access control protocols, and user privacy preservation
protocols are presented. After enumerating various possible attacks, the
chapter provides a detailed discussion on various existing security mechanisms
and protocols to defend against and wherever possible prevent the possible
attacks. Comparative analyses are also presented on the security schemes with
regards to the cryptographic schemes used, key management strategies deployed,
use of any trusted third party, computation and communication overhead involved
etc. The chapter then presents a brief discussion on various trust management
approaches for WMNs since trust and reputation-based schemes are increasingly
becoming popular for enforcing security in wireless networks. A number of open
problems in security and privacy issues for WMNs are subsequently discussed
before the chapter is finally concluded.Comment: 62 pages, 12 figures, 6 tables. This chapter is an extension of the
author's previous submission in arXiv submission: arXiv:1102.1226. There are
some text overlaps with the previous submissio
An SDN-based Approach For Defending Against Reflective DDoS Attacks
Distributed Reflective Denial of Service (DRDoS) attacks are an immanent
threat to Internet services. The potential scale of such attacks became
apparent in March 2018 when a memcached-based attack peaked at 1.7 Tbps. Novel
services built upon UDP increase the need for automated mitigation mechanisms
that react to attacks without prior knowledge of the actual application
protocols used. With the flexibility that software-defined networks offer, we
developed a new approach for defending against DRDoS attacks; it not only
protects against arbitrary DRDoS attacks but is also transparent for the attack
target and can be used without assistance of the target host operator. The
approach provides a robust mitigation system which is protocol-agnostic and
effective in the defense against DRDoS attacks
An autonomous router-based solution to detect and defend low rate DDoS attacks
Internet security was not a concern when the Internet was invented, but we cannot deny this fact anymore. Since all forms of businesses and communications are aligned to the Internet in one form or the other, the security of these assets (both infrastructure and content) is of prime importance. Some of the well known consequences of an attack include gaining access to a network, intellectual property thefts, and denial of service.
This thesis focuses on countering flood-type attacks that result in denial of service to end users. A new classification of this denial of service attacks, known as the low rate denial of service, will be the crux of our discussion. The average rate of this attack is so low that most routers or victims fail to detect the attack. Thus far, no solution can counter the low rate attacks without degrading the normal performance of the Transmission Control Protocol. This work proposes a router-based solution to detect and defend low as well as high rate distributed denial of service attacks (DDoS). A per flow approach coupled with the Deterministic Packet Marking scheme is used to detect and block attack flows autonomously. The solution provides a rapid detection and recovery procedure during an attack
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