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SUMMARY:VerLoc: Verifiable Localization in Decentralized Systems - Kathari
 na Kohls\, Radboud University
DTSTART:20220517T130000Z
DTEND:20220517T140000Z
UID:TALK170576@talks.cam.ac.uk
CONTACT:Kieron Ivy Turk
DESCRIPTION:We tackle the challenge of reliably determining the geolocatio
 n of nodes in decentralized networks\, considering adversarial settings an
 d without depending on any trusted landmarks. In particular\, we consider 
 active adversaries that control a subset of nodes\, announce false locatio
 ns and strategically manipulate measurements. To address this problem we p
 ropose\, implement and evaluate VerLoc\, a system that allows verifying th
 e claimed geo-locations of network nodes in a fully decentralized manner. 
 VerLoc securely schedules roundtrip time (RTT) measurements between random
 ly chosen pairs of nodes. Trilateration is then applied to the set of meas
 urements to verify claimed geo-locations. We evaluate VerLoc both with sim
 ulations and in the wild using a prototype implementation integrated in th
 e Nym network (currently run by thousands of nodes). We find that VerLoc c
 an localize nodes in the wild with a median error of 60 km\, and that in a
 ttack simulations it is capable of detecting and filtering out adversarial
  timing manipulations for network setups with up to 20 % malicious nodes.
LOCATION:Webinar - link on talks.cam page after 12 noon Tuesday
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