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d relatively infrequently. ● Onthewire efficiency may be important in lowbandwidth scenarios, but again protocol is not run that often, pared to MACsec. DOS resistance ● Modern keyagreement protocols fertile ground for DOS attacks. ● Look to other schemes (IKE, for example) to provide guidance. ● No perfect antiDOS schemes – Increase unpleasantnesss for attacker – Detect and throw away bogosity at the earliest, cheapest point in the protocol.