COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |
University of Cambridge > Talks.cam > Wednesday Seminars - Department of Computer Science and Technology > Defending Networked Resources Against Floods of Unwelcome Requests
Defending Networked Resources Against Floods of Unwelcome RequestsAdd to your list(s) Download to your calendar using vCal
If you have a question about this talk, please contact Mateja Jamnik. The Internet is afflicted by unwelcome “requests”, defined broadly 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 human’s attention (in the case of spam). Traditional responses to these problems apply heuristics: they try to identify “bad” requests based on their content (e.g., in the way that spam filters analyze an email’s text). This talk argues that heuristics are inherently gameable and that defenses should instead aim to allocate resources proportionally to all clients (so if, say, 10% of the requesters of some scarce resource are “bad”, those clients should be limited to 10% of the resources). To meet this goal, this talk presents two systems. The first is a denial-of-service mitigation in which clients 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 distributed system for enforcing per-sender email quotas to control spam. This system scales to a workload of millions of requests per second, tolerates arbitrary faults in its constituent hosts, and resists a variety of attacks. It achieves this fault-tolerance despite storing only one copy (roughly) of any given datum and, ultimately, does a fairly large job with fairly little mechanism. This talk is part of the Wednesday Seminars - Department of Computer Science and Technology series. This talk is included in these lists:
Note that ex-directory lists are not shown. |
Other listsOpen Research Cambridge Modern Greek Lecture Series Betty & Gordon Moore Library NewsOther talksHow does functional neuroimaging inform cognitive theory? “Soap cost a dollar”: Jostling with minds in economic contexts Viral evolution on sub-phylogenetic timescales Towns, Cities and the Tilting of Britain's Political Axis An Introduction to Cluster Categories of Type A The Anne McLaren Lecture: CRISPR-Cas Gene Editing: Biology, Technology and Ethics Cambridge-Lausanne Workshop 2018 - Day 1 Stereodivergent Catalysis, Strategies and Tactics Towards Secondary Metabolites as enabling tools for the Study of Natural Products Biology Speculations about homological mirror symmetry for affine hypersurfaces How to Deploy Psychometrics Successfully in an Organisation |