REPUTATION

1
REPUTATION TRUST MANAGEMENT IN P2P
Sta??p????? ???e??a Ge??????a? ??sta?
2
REPUTATION TRUST MANAGEMENT IN P2P

• ??sa????
• Trust
• Reputation
• Anonymity
• ?e?????? Trust Management
• S?????se??-S?µpe??sµata

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??S?GOG?

• Trust H eµp?st?s??? p?? de???e? ??a? ??µß?? se
  ??a ???? a?t?p??s?pe?e?/ape??????e? t? ?at? p?s?
  p?ste?e? ?t? ? s??a??a?? t??? ?a e??a? s?st? ?a?
  ????????µ???.
• Reputation ? f?µ? e??a? ? ?p??? p?? ??e? ??a?
  peer ??a ??p???? ???? ?a? d?aµ??f??eta?/e??µe???e
  ta? t?s? ap? t?? p??????µe?e? ?µese? s??a??a???
  t??? ?s? ?a? ap? t?? p????f???a p?? pa???eta? ap?
  ?????? ??µß??? t?? d??t??? ?a? ? ?p??a s?et??eta?
  µe pa???te?e? s??a??a??? t?? ??µß?? a?t?? µe t??
  s???e???µ??? peer.
• Anonymity ? a????µ?a e??a? ? ?d??t?ta t??
  s?st?µat?? ?a ap????pte? ta a?a?????st??a
  ?a?a?t???st??? t?? ??µß?? ?ata t? d????e?a t??
  s??a??a???

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TRUST MANAGEMENT

• ?e t?? ??? trust management e?????µe t?? te??????
  µe t?? ?p??e? ?p??????eta? t? trust p?? ??e? ???e
  ??µß?? ??a ??p???? ????.
• ?e?????? d?a?e???s?? eµp?st?s????
• Reputation-based trust management
• social network-based trust management

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REPUTATION-BASED TRUST MANAGEMENT

• Reputation-based ?aµß??eta? ?p???? t?s? ?
  ?p??e?µe???? ?p???, t?p??? p????f???a, p?? ??e?
  ? ??µß?? ? ?p???? ???e? t?? a???????s?, ?s? ?a? ?
  ?a?????? ?p???, ?p??? ???? t?? ??µß??, t??
  d??t??? ??a t?? f?µ? t?? ?p?-a???????s? ??µß??.
• XREP
• P-GRID
• NICE
• Framework Using Currency

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XREP

• S??d?asµ?? resource ?a? servent reputation
• ??e?a???? ??f?f???a? µeta?? t?? ??µß??
• F?se??
• resource searching
• resource selection vote polling
• vote evaluation
• best servent check
• resource downloading

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XREP
Resource Searching
Query
QueryHit
A
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XREP
Vote Polling
Poll
PollReply
A
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XREP
Best Servent Check Download
Vote Evaluation
TrueVote
TrueVoteReply
A
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P-GRID

• ??d?s? complaints
• ??sa???? a???t?s? complaints (P-Grid)
• Path ??µß?? Prefix part ??e?d???-complaint
• T(p)????µe?? complaints p?? ????? e?d??e? ??
  a?t?? ep? complaints p?? ??e? e?d?se? a?t??

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NICE

• Cookies
• Strongest path

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NICE
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Framework Using Currency

• ???????? ??µ?sµa, ?p?? ? p???t?? a?t?st???e? st?
  f?µ?.
• ???e ??µß?? ?µad?p??e? t??? ?p????p??? (Bad,
  Good, f)
• Trust Communities
• ?p?t???? s??a??a?? a???s? p???t?? (f?µ??) ??µß??
  ?a? t?? community.
• A?ep?t???? s??a??a?? d?µ??????a complaint t?
  ?p??? p????e?ta? se ??? t? d??t??. ?e??s? p???t??
  ??µß?? ?a? community.

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SOCIAL NETWORK-BASED TRUST MANAGEMENT

• Social network-based ?aµß????ta? ?p??? ??
  ?????????? desµ?? p?? ????? a?apt???e? a??µesa
  sta µ??? t?? d??t???. ?? desµ?? a?t?? µp??e? ?a
  e??a? desµ?? f???a?, s??e??as?a?, aµ??ßa?a?
  ?p?st??????, ?µ???t?ta? ?.a., ?? ?p????
  ??s?ast??? a?t?p??s?pe???? desµ??? eµp?st?s????
  µeta?? t?? ??µß??, ?a? a?apa??st???ta? µe t??
  d?µ??????a e??? ?????????? d??t???
• REGRET
• NodeRanking

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REGRET

• at?µ??? d??stas?
• ????????? d??stas?
• Ra?b Ra?B RA?b RA?B
• ??t??????? d??stas?

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NodeRanking

• Social network- graph

Authority
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S?G???S??S - S??????S????
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???F???S

• 1 Ernesto Damiani, Sabrina De Capitani di
  Vimercati, Stefano Paraboschi, Pierangela
  Samarati and Fabio Violante. A Reputation-Based
  Approach for Choosing Reliable Resources in
  Peer-to-Peer Networks. 9th ACM Conference on
  Computer and Communications Security, Washington
  DC. (2002)
• 2 Karl Aberer and Zoran Despotovic. Managing
  Trust in a Peer-2-Peer Information System.
  Conference on Information and Knowledge
  Management, Atlanta, Georgia. (2001)
• 3 Seungjoon Lee, Rob Sherwood and Bobby
  Bhattacharjee. Cooperative peer groups in NICE.
  IEEE Infocom, San Francisco, USA. (2003)
• 4 Rohit Gupta and Arun K. Somani. Cooperative
  Peer Groups in NICE. 4th International
  Conference on Peer-to-Peer Computing, Zurich,
  Switzerland. (2004)
• 5 Jordi Sabater and Carles Sierra. REGRET A
  Reputation Model for Gregarious Societies. 4th
  Workshop on Deception, Fraud and Trust in Agent
  Societies, Montreal, Canada. (2001)
• 6 Josep M. Pujol, Ramon Sanguesa and Jordi
  Delgado. Extracting reputation in multi agent
  systems by means of social network topology.
  First International Joint Conference on
  Autonomous Agents and Multi-Agent Systems,
  Bologna, Italy. (2002)
• 8 http//www.irchelp.org/irchelp/security/
• 9 http//spam.abuse.net/overview/whatisspam.shtm
  l
• 10 Roger Dingledine, Nick Mathewson and Paul
  Syverson. Reputation in P2P Anonymity Systems.
  Workshop on economics of p2p systems, Berkley CA.
  (2003)
• 11 http//www.cc.gatech.edu/projects/disl/specia
  lProjects/anonymity.htm