NDLI: Using graphic turing tests to counter automated DDoS attacks against web servers

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Using graphic turing tests to counter automated DDoS attacks against web servers

Content Provider	ACM Digital Library
Author	Keromytis, Angelos D. Misra, Vishal Cook, Debra L. Rubenstein, Dan Morein, William G. Stavrou, Angelos
Abstract	We present WebSOS, a novel overlay-based architecture that provides guaranteed access to a web server that is targeted by a denial of service (DoS) attack. Our approach exploits two key characteristics of the web environment: its design around a human-centric interface, and the extensibility inherent in many browsers through downloadable "applets." We guarantee access to a web server for a large number of previously unknown users, without requiring pre-existing trust relationships between users and the system.Our prototype requires no modifications to either servers or browsers, and makes use of graphical Turing tests, web proxies, and client authentication using the SSL/TLS protocol, all readily supported by modern browsers. We use the WebSOS prototype to conduct a performance evaluation over the Internet using PlanetLab, a testbed for experimentation with network overlays. We determine the end-to-end latency using both a Chord-based approach and our shortcut extension. Our evaluation shows the latency increase by a factor of 7 and 2 respectively, confirming our simulation results.
Starting Page	8
Ending Page	19
Page Count	12
File Format	PDF
ISBN	1581137389
DOI	10.1145/948109.948114
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2003-10-27
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Java Graphic turing tests Web proxies
Content Type	Text
Resource Type	Article

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