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2003
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Using graphic turing tests to counter automated DDoS attacks against web servers

8 years 11 months ago
Using graphic turing tests to counter automated DDoS attacks against web servers
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 preexisting 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 eval...
William G. Morein, Angelos Stavrou, Debra L. Cook,
Added 06 Jul 2010
Updated 06 Jul 2010
Type Conference
Year 2003
Where CCS
Authors William G. Morein, Angelos Stavrou, Debra L. Cook, Angelos D. Keromytis, Vishal Misra, Dan Rubenstein
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