SOS-Bott - ,ETAL PresentedBy JaredBott April8,2010 Overview...

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Click to edit Master subtitle style  7/15/11 Original paper by Keromytis, ET AL. Presented By Jared Bott April 8, 2010 Secure Overlay Services
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 7/15/11 Overview SOS Background Problem 1 Problem Transformation? Problem 2 Problem Transformation with an NP-C Problem
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 7/15/11 Secure Overlay Services Network architecture designed to provide  secure communication between certified  users and a server Published in 2002 at SIGCOMM Runs upon CHORD
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 7/15/11 SOS Nodes Different kinds of nodes SOAP Beacon Secret Servlet Restrict access to server to only a few secret  IP addresses Secret Servlets Beacons know who Secret Servlets are
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 7/15/11 SOS Nodes Users verified by an access point SOAP Beacons and Secret Servlets externally the same as  SOAPs SOAPs pass message randomly amongst themselves Eventually message ends up at a Secret Servlet or a  Beacon Forward to Secret Servlet or to target server
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 7/15/11 Problem 1 In a given SOS network, can an attacker  disable access to the target server by  disabling k nodes? Attacker doesn’t know which nodes are Beacons,  Secret Servlets, selects nodes to attack at random Attacker may not know who users or target are Answer is dependent upon network structure
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 7/15/11 Example K=2 Can disable  S1+S2,  B3+SS1,  SS1+SS2 S 1 S 2 B 1 B 2 B 3 S S 1 S S 2 Targ et Users
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SOS-Bott - ,ETAL PresentedBy JaredBott April8,2010 Overview...

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