lecture18-ariadne - Overview Lecture 18 Secure Ad Hoc...

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3/23/09 1 1 Lecture 18 Secure Ad Hoc Network Routing Adrian Perrig 18-731: Network Security Spring 2009 2 Overview Administrative issues Midsemester grades now available on Blackboard Miniproject 2 out soon Adrian Lisbon: office hours in Lisbon this Friday Dave Andersen is lecturing next Tuesday 3 Attacks Against Routing Send away packets normally routed through node Example: Fail to advertise a route But router could just fail to forward packets Attract packets normally routed elsewhere Example: Claim good routes to far-away nodes Fail to forward packets sent for forwarding Doesn’t attack the routing protocol 4 On-Demand Source Routing: DSR Dynamic Source Routing [Johnson, 94] intuition: Operate completely on-demand Cache learned links in a graph data structure Use source routing for simplicity Route Cache at node A A B F D C E
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3/23/09 2 5 On-Demand Source Routing: DSR Dynamic Source Routing [Johnson, 94] intuition: Operate completely on-demand Cache learned links in a graph data structure Use source routing for simplicity Route Cache at node A A B F D C E 6 A target=E, id=3 DSR Route Discovery When a node needs a route to a destination: Broadcast a R OUTE R EQUEST with source, target, id When hearing a R OUTE R EQUEST for another node: Drop if already seen R EQUEST from same Discovery Else, append address to node list & rebroadcast A B C D E 7 A target=E, id=3 DSR Route Discovery When a node needs a route to a destination: Broadcast a R OUTE R EQUEST with source, target, id When hearing a R OUTE R EQUEST for another node: Drop if already seen R EQUEST from same Discovery Else, append address to node list & rebroadcast A B C D E A, B target=E, id=3 8 A, B, D target=E, id=3 DSR Route Discovery When a node needs a route to a destination: Broadcast a R OUTE R EQUEST with source, target, id When hearing a R OUTE R EQUEST for another node: Drop if already seen R EQUEST from same Discovery Else, append address to node list & rebroadcast A B C D E A target=E, id=3 A, B target=E, id=3
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3/23/09 3 9 A, B, D target=E, id=3 DSR Route Discovery When a node needs a route to a destination: Broadcast a R OUTE R EQUEST with source, target, id When hearing a R OUTE R EQUEST for another node: Drop if already seen R EQUEST from same Discovery Else, append address to node list & rebroadcast A B C D E A, C target=E, id=3 A target=E, id=3 A, B target=E, id=3 10 A, B, D target=E, id=3 DSR Route Discovery When a node needs a route to a destination: Broadcast a R OUTE R EQUEST with source, target, id When hearing a R OUTE R EQUEST for another node: Drop if already seen R EQUEST from same Discovery Else, append address to node list & rebroadcast A B C D E A target=E, id=3 A, B target=E, id=3 11 DSR Route Discovery When hearing a R OUTE R EQUEST for this node: Return a R OUTE R EPLY to the initiator E received a R EQUEST : target=E, route=A,B,D: A B C D E A,B,D,E 12 DSR Route Discovery When hearing a R OUTE R EQUEST
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