Ostra: Leveraging trust to thwart unwanted communication Alan - - PowerPoint PPT Presentation

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ostra leveraging trust to thwart unwanted communication

Ostra: Leveraging trust to thwart unwanted communication Alan - - PowerPoint PPT Presentation

Feb 06, 2024 313 likes •520 views

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

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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

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15.10.2007 SOSP 2007 WiP Alan Mislove

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?

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Ostra: A new approach

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Ostra: A new approach

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Ostra: A new approach

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Destination Source

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Ostra: A new approach

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Destination Source

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Ostra: A new approach

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Destination Source

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Ostra: A new approach

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x

Destination Source

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Ostra: A new approach

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Source Destination

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Ostra: A new approach

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Source Destination

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Ostra: A new approach

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Source Destination

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Ostra: A new approach

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Source Destination

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Ostra: A new approach

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Source Destination

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No requirement of strong identities

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No requirement of strong identities

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{

Sybils

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No requirement of strong identities

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{

Sybils

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No requirement of strong identities

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{

Sybils

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No requirement of strong identities

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{

Sybils

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15.10.2007 SOSP 2007 WiP Alan Mislove

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

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15.10.2007 SOSP 2007 WiP Alan Mislove

Thanks!

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