OneSwarm: Privacy Preserving P2P
Roberto Alberdeston
CAP 6135
Spring 2012
Reference: Privacy-preserving P2P data sharing with OneSwarm
http://oneswarm.cs.washington.edu
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http://www.OneSwarm.org
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OneSwarm Terms
P2P - a computer network in which
each computer in the network can
act as a client or server, allowing
shared access to resources without
central server.
 Swarm - is the collective behavior of
decentralized, self-organized
systems.

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OneSwarm Characteristics

Privacy Focused P2P Network

User Defined Access Control

Data is transferred using trusted and
untrusted nodes. (transfer dependent)
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OneSwarm Characteristics (cont)

Multi Path Packet Transfer

Congestion Aware Network

Bit Torrent Capable Client
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Issues with Current P2P Systems

Bit Torrent
– Great performance but poor privacy

Freenet
– Anonymous but lacks access control

TOR
– Nodes participate in questionable traffic
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OneSwarm Key Focus Areas
User
Based Privacy
Performance
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OneSwarm Benefits
 Better
Performance/Privacy
 Runs most file formats natively
 Bit Torrent Compatible
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OneSwarm Benefits (cont)
 Multiple
Permission Settings
 Persistent Identities
 Multi Path Packet Delivery
 Cost Reduction for Content
Distribution (ex: YouTube)
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OneSwarm Data Transfers
 Mesh
of trusted/untrusted nodes
 Three Types of Transfers
– Public
– No Attribution (Anonymous)
– With Permission (friend-2-friend)
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OneSwarm Data Sharing
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OneSwarm: Finding Data
 Public/No
Attribution
– Search Based
 Private
– Advertising
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OneSwarm Components

Client/Node
– Trusted
– Untrusted
Replicas
 Community Servers

– Key Management + Transfer
– Groups/Subscriptions
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OneSwarm Node Privacy

Each Client/Node
– ID using public (RSA) key per node

List of Nodes
– List kept in DHT (distributed hash table)
– DHT has 20 copies (fault tolerance)

Data/Files
– Named with 160-bit SHA-1 hash
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Growing the Swarm

Gtalk User List
– Import Gtalk Connection

Local Area Network
– Automatically shared keys with LAN

Manual Key Exchange (Friends)
– Most Popular Method
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OneSwarm: Fairness
New Users start with default
“contribution” value.
 If the upload/download ratio > 1, user
is given access to more nodes in
transfer.
 Promotes fairness and ensures
performance

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OneSwarm Security
Protocol Security Components
 Prevent Timing + Collusion Attacks
 Components

– Randomization of Nodes
– Force Delays
– User Control Forwarding Probability
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OneSwarm Testing

Real World
– LonePlanet Computers
– 100k User Provided Statistics

Simulation
– Last.fm Social Graph
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OneSwarm Testing (cont)

Data Analysis
– Session Times
– Geographic Distribution
– Usage Patterns
– Upload Capacity
– Download Capacity
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OneSwarm Testing (cont)

Results of Testing
– Most permission based relationship
were friend-to-friend
– Transfers over the multipath P2P
network FASTER than point-point
– Temporarily overloaded clients NOT
common
– Transfer Speed >> TOR
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OneSwarm Conclusion

P2P Network
– Privacy
– Performance
User Based Permissions
 Mesh of Trusted and Untrusted
Nodes

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OneSwarm Conclusion (cont)

Three Data Sharing Models
– Public
– Anonymous
– Private
Inherent Security Components
 Best PRIVACY/PERFORMANCE

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OneSwarm Conclusion
Questions?
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