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SUMMARY:Hiding on an Ethernet - Richard Clayton\, University of Cambridge
DTSTART:20060228T161500Z
DTEND:20060228T171500Z
UID:TALK5484@talks.cam.ac.uk
CONTACT:Saar Drimer
DESCRIPTION:Traceability on the Internet is the process of determining who
  was using a particular IP address at a particular time. In this talk I wi
 ll show how fuzzy this idea becomes at the edges of the network when users
  are on an Ethernet — a broadcast medium — where the notion of identit
 y becomes a matter of agreement rather than immutable fact. The hacker com
 munity has long known about ARP spoofing\; but I've found a new trick. As 
 a part of my PhD work I built some hardware that permitted one machine to 
 borrow someone else's IP address and Ethernet MAC address and thereby impe
 rsonate them\, even when they were actively using their machine. Then\, by
  chance\, I found that I'd taken far too complicated an approach — and m
 odern software firewalls\, that are supposed to make you more secure — p
 ermit others to impersonate you with impunity. This has significant implic
 ations not only for traceability\, but also for the builders of NATs\, and
  especially for the business models of those who overcharge for their WiFi
  hotspots.
LOCATION:Lecture Theatre 2\, Computer Laboratory\, William Gates Building
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