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Attacks on the routing system, with the goal of diverting traffic past an enemy-controlled point for purposes of eavesdropping or connection-hijacking, have long been known. In principle, at least, these attacks can be countered by use of appropriate authentication techniques. The authors demonstrate a new attack, based on link-cutting, that cannot be countered in this fashion. Armed with a topology map and a list of already-compromised links and routers, an attacker can calculate which links to disable, in order to force selected traffic to pass the compromised elements.
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