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DTSTART:20191103T020000
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RDATE:20201101T020000
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UID:calendar.392226.field_event_date.0@www.wright.edu
DTSTAMP:20260220T000912Z
CREATED:20200416T195328Z
DESCRIPTION:Webex Meeting Link: https://wright.webex.com/wright/j.php?MTID=
 mf4a5c45c94cc04f9dd96f4fd61db258aPh.D. Committee:  Drs. Derek Doran\, Advi
 sor\, Michael Raymer\, Krishnaprasad Thirunarayan\, and Amir Zadeh (Inform
 ation Systems and Supply Chain Management)ABSTRACTTor is the most popular 
 dark network in the world. Its noble uses\, including as a platform for fr
 ee speech and information dissemination under the guise of true anonymity\
 , make it an important socio-technical system in society. Although activit
 ies in socio-technical systems are driven by both structure and informatio
 n\, past studies on evaluating Tor investigate its structure or informatio
 n exclusively and narrowly\, which inherently limits our understanding of 
 Tor. This dissertation bridges this gap by contributing insights into the 
 logical structure of Tor\, the types of information hosted on this network
 \, and the interplay between its structure and information. These insights
  arise from three studies:(a)  we perform a comprehensive crawl of the Tor
  dark Web and\, through topic and net- work analysis\, characterize the ty
 pes of information and services hosted across a wide swath of Tor domains 
 and their hyperlink relational structure. 
(b)  we study the potential for
  thought-to-be isolated information on the dark Web to be leaked into the 
 public surface Web by providing a broad evaluation on the network of refer
 encing from Tor to surface Web. 
(c)  we investigate the structural identi
 ty of Tor domains as an indicative of their neighborhood structure\, indep
 endent of their either service type or location in the network. 
Our studi
 es unearth previously unknown properties of Tor\, including the finding th
 at Tor domain types can be categorized into nine groups defined by the inf
 ormation they host. We unveil how services for releasing and searching inf
 ormation do emerge as the dominant type of Tor domains. Our importance eva
 luation identifies Dream marketplaces and directory domains as Tor core se
 rvices and crucial entry points for probes\, respectively. Connectivity an
 alyses reveal some patterns of cooperation and competition among Tor domai
 ns. We also present measurements that indicate how some types of domains i
 ntentionally silo themselves from the rest of Tor.The investigation on the
  dark-to-surface referencing network reveals this network as a single mass
 ive connected component where over 90% of Tor hidden services have at leas
 t one link to the surface world despite their interest in being isolated f
 rom surface Web tracking. This referencing puts Tor domains closer to each
  other and encourages them to cluster. However\, it does not raise the dom
 ains’ contribution to either communication or information dissemination th
 rough the Tor network.Analyses on the Tor structural identity indicate tha
 t Tor domains can be categorized into eight groups based on their neighbor
 hood structure. Dream market has its own class: an almost fully connected 
 neighborhood structure which is robust against node removal. Linking struc
 ture of Tor domains can further make differences in their structural ident
 ities. The domains with direct links to the others with high out-degree ce
 ntrality form the dominant structural identity on Tor. This identity makes
  the 2nd-degree neighborhood of Tor domains robust against node removal or
  targeted attack despite their tendency towards isolation. 
DTSTART;TZID=America/New_York:20200422T110000
DTEND;TZID=America/New_York:20200422T130000
LAST-MODIFIED:20200416T200147Z
LOCATION:Webex Virtual Event
SUMMARY:Ph.D. Dissertation Defense “New Perspectives ĚÇĐÄÔ­´´ the Tor Ecosyste
 m: Integrating Structure with Information” By Mahdieh Zabihimayvan
URL;TYPE=URI:/events/phd-dissertation-defense-%E2%80%
 9Cnew-perspectives-about-tor-ecosystem-integrating-structure
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