UTCS Colloquium/FACULTY CANDIDATE: Michael Walfish - FACULTY CANDIDATE Massachusetts Institute of Technology CSAIL Defending Networked Resources Against Floods of Unwelcome Requests ACES 2.302 Thursday April 26 2007 at 11:00 a.m.
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Speaker Name: Michael Walfish - FACULTY CANDIDATE
iliation: Massachusetts Institute of Technology CSAIL
Start Time: 11:00a.m.
End Time: 12:00p.m.
Location: ACES 2.302
Host: Lorenzo Alvisi
Talk Title: Defe
nding Networked Resources Against Floods of Unwelcome Requests
The Internet is afflicted by unwelcome requests defined b
as claims on a scarce resource such as a server''s CPU (in
the case of spurious traffic whose purpose is to deny service)
or a hum
an''s attention (in the case of spam). Traditional
responses to these p
roblems apply heuristics: they try to
identify bad requests based on th
eir content (e.g. in
the way that spam filters analyze an email''s tex
talk argues that heuristic attempts at filtering are inherent
gameable and instead presents two systems that limit request
umes directly. The first is a denial-of-service mitigation
in which cli
ents are encouraged to automatically send *more*
traffic to a besieged
server. The good clients can thereby
compete equally with the bad ones.
The second is a system
for enforcing *per-sender email quotas* to cont
This system scales to a workload of millions of requests
per second tolerates Byzantine faults in its constituent
hosts and re
sists a variety of attacks.
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