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Ostra: Leveraging trust to thwart unwanted communication Alan Mislove Ansley Post Krishna Gummadi Peter Druschel Max Planck Institute for Software Systems Rice University SOSP 2007 Work in Progress Session Unwanted

  1. Ostra: Leveraging trust to thwart unwanted communication Alan Mislove †‡ Ansley Post †‡ Krishna Gummadi † Peter Druschel † † Max Planck Institute for Software Systems ‡ Rice University SOSP 2007 Work in Progress Session

  2. Unwanted communication • Unwanted communication is a known problem • Spam in email • Spreading to popular emerging systems • Example: Mislabeled videos plaguing YouTube • Usual defenses don’t work • Content filtering on video content? 15.10.2007 SOSP 2007 WiP Alan Mislove 2

  3. Ostra: A new approach 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  4. Ostra: A new approach 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  5. Ostra: A new approach Destination Source 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  6. Ostra: A new approach Destination Source 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  7. Ostra: A new approach Destination Source 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  8. Ostra: A new approach Destination x Source 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  9. Ostra: A new approach Destination Source 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  10. Ostra: A new approach Destination Source 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  11. Ostra: A new approach Destination Source 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  12. Ostra: A new approach Destination Source 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  13. Ostra: A new approach Destination x Source 15.10.2007 SOSP 2007 WiP Alan Mislove 3

  14. No requirement of strong identities 15.10.2007 SOSP 2007 WiP Alan Mislove 4

  15. No requirement of strong identities { Sybils 15.10.2007 SOSP 2007 WiP Alan Mislove 4

  16. No requirement of strong identities { Sybils 15.10.2007 SOSP 2007 WiP Alan Mislove 4

  17. No requirement of strong identities { Sybils 15.10.2007 SOSP 2007 WiP Alan Mislove 4

  18. No requirement of strong identities { Sybils 15.10.2007 SOSP 2007 WiP Alan Mislove 4

  19. Ostra: Leveraging trust • We present Ostra, a new approach • Prevents unwanted communication in an existing system • Examples: Email, Skype, IM, YouTube • Ostra uses the relationships which exist between users • Often already present (i.e. social networks) • Ostra has desirable properties • Does not require global user identities • Does not rely on automatic content classification • Respects recipient’s notion of wanted/unwanted communication 15.10.2007 SOSP 2007 WiP Alan Mislove 5

  20. Thanks! 15.10.2007 SOSP 2007 WiP Alan Mislove 6

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