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U C L
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U C L

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  1. daniele quercia UCL

  2. I finished my PhD @

  3. University College London

  4. <My Research>

  5. Ratings on ...

  6. Ratings on phones

  7. Whyratings on mobiles?

  8. Daniele Quercia Situation: People exchange digital content

  9. People

  10. The problem is ...

  11. drowning user (content overload) help! who will come to the rescue?

  12. Proposal: Accept content only from reputable people

  13. Store Use

  14. MobiRate Store Use [Ubicomp08]

  15. LDTP MobiRate Store Use [Ubicomp08] [ICDM07]

  16. How to store ratings?

  17. 2. Gossip(to check each credential) 1.Log(credentials)

  18. 2. Gossip(to check each credential) 1.Log(credentials)  Impractical 

  19. Idea behind MobiRate

  20. Let’s make it practical...

  21. 1.Sealed Log(of credentials) 2. Gossip(to check seals only)

  22. 1.Sealed Log(of credentials) 2. Gossip(to check seals only)  Practical 

  23. 1.Sealed Log(of credentials) entry (rating) “seal” (for the entry)

  24. 1.Sealed Log(of credentials) entry (rating) “seal” (for the entry) “hash chain” binding whole table

  25. Assumption ID is a unique public key

  26. witnesses [slow down]

  27. What witnesses do Audit! [slow down]

  28. What witnesses do Audit! Why? [slow down]

  29. [Exposed]

  30. Who are my witnesses Those who will share content with me

  31. . Who are my witnesses Like-minded familiar strangers

  32. 1.Sealed Log(of credentials) 2. Gossip(to check seals only)  Practical 

  33. Does MobiRate work?

  34. Mobility Traces AND Social Networks Reality Mining

  35. Does MobiRate work? <1> Is it robust to malicious individuals? <2> Does it run on phones?

  36. <1> robust The f factor

  37. Oracle MobiRate

  38. MobiRate reduces f!!!

  39. <2> run

  40. “heaviest” protocol runs < 2sec

  41. “longest” protocol completed in 2.5ms(if Bluetooth 100kb/s)

  42. MobiRate works  robust  runs on phones

  43. MobiRate Store Use [Ubicomp08]

  44. LDTP MobiRate Store Use [Ubicomp08] [ICDM07]