Privacy-Preserving Longevity Study of Hidden Services

Motivation: Very little is known about the lifespan of onion services and their statistical properties in general. Such knowledge can provide manifold benefits. For instance, it can provide insights into the resource needs and trends of onion services, allowing a better understanding of the Tor infrastructure performance and dimensioning. Furthermore, one can also imagine that such information be used for the detection of malicious domains. Overall, we believe that learning about the aggregate stastical properties of onion services is beneficial.

However, to avoid disrupting Tor's security and privacy services, any study must be carried out in a privacy preserving manner. The distributed nature of Tor and hidden services makes such study non-trivial and introduces challenges that need to be carefully addressed. Along the lines as previous privacy-preserving studies on Tor, we designed a set of techniques that computes an estimate of the distribution of the lifetime of onion services without enabling any single participant/team member to learn anything alone. We validated our approach by the Tor safety board and incorporated their feedback in our process for implementing our system and disclosing our experiments.

Experiment Status: ON



We are running our relays and experiments now.

Who We Are

We are a collaboration between three teams at Airbus, Northeastern University, and University of Buffalo:

Our Relays (HSDirs) Information

  • Nickname: arg
  • Contact: privacy@ccs.neu.edu
  • OR Port: 9001, 9003
  • Dir Port: 9002, 9004
  • Advertised Bandwidth: 250 KiB/s

Tor Safety Board

After careful review, the Tor resarch safety board has approved our research. You can find our original submission to the board here.

Fingerprints

Northeastern University:

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Airbus Group Innovations

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University of Buffalo

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