NDLI: Overloading vulnerability of VoIP networks

Content Provider	IEEE Xplore Digital Library
Author	Sengar, H.
Copyright Year	2009
Description	Author affiliation: Technology Development Dept., NuVox Communications, Greenville, SC, USA (Sengar, H.)
Abstract	Internet is vulnerable to overloading caused by flash crowds and distributed denial-of-service (DDoS) attacks. Recently vo ice over IP (VoIP), an Internet-based service is experiencing a phenomenal growth. As its deployment spreads, VoIP systems are likely to become attack targets, of which flooding lists high, perhaps due to its simplicity and the abundance of tool support. The DDoS attacks and flash crowds degrade the performance of call processing server to the point where it becomes sluggish and even unresponsive. The network administrator's dilemma is that how to give a differential treatment to malicious and legitimate call requests that differ in intent, but not in content. In this paper, we show that DDoS attacks and flash crowds, while similar in the message structure and the number of INVITEs they generate, exhibit different traffic patterns and hence making them distinguishable. We also introduce a new entropy-based approach to detect those DDoS attacks that masquerade as flash crowds. Our approach is based on an observation that the creation of malicious sessions has certain effects on entropy of the call durations; hence, a change in the entropy provides an important clue for mimicry attack detection. As an overloading preventive measure, we exploit the SIP protocol's inbuilt reliability mechanism and exponential backoff timer values to regulate and distinguish legitimates call requests from the spoofed ones.
Starting Page	419
Ending Page	428
File Size	1050252
Page Count	10
File Format	PDF
ISBN	9781424444229
DOI	10.1109/DSN.2009.5270310
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-29
Publisher Place	Portugal
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Computer crime Internet telephony Web server Floods Web and internet services Network servers Entropy Terrorism Personal communication networks Surges
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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