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Balancing the shadows

Published: 04 October 2010 Publication History

Abstract

In this paper, we examine the ShadowWalker peer-to-peer anonymity scheme. ShadowWalker attempts to provide anonymity via circuits built using random walks over a secured topology. ShadowWalker's topology is secured through the use of shadows, peers that certify another node's routing information. We demonstrate two flaws in ShadowWalker. First, an attacker can compromise the underlying topology of ShadowWalker as a result of an insufficient numbers of shadows. We show that the failure of the underlying topology directly results in the failure of ShadowWalker to provide anonymity guarantees. Second, the dependence on untrusted nodes to certify other nodes allows an attacker to launch a selective denial of service attack. We show that there is an inherent tension between protecting against these two attacks: weakening the first attack strengthens the second attack and vice versa. We introduce a mechanism that generalizes ShadowWalker's lookup defense, and show that this mechanism can be tuned to simultaneously provide strong protection against both these attacks. Last, we implement ShadowWalker and provide performance measurements from a prototype deployment on PlanetLab.

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  • (2024)Periscoping: Private Key Distribution for Large-Scale MixnetsIEEE INFOCOM 2024 - IEEE Conference on Computer Communications10.1109/INFOCOM52122.2024.10621274(681-690)Online publication date: 20-May-2024
  • (2023)On the (In)security of Peer-to-Peer Decentralized Machine Learning2023 IEEE Symposium on Security and Privacy (SP)10.1109/SP46215.2023.10179291(418-436)Online publication date: May-2023
  • (2021)WhisperChord: Scalable and Secure Node Discovery for Overlay Networks2021 IEEE 46th Conference on Local Computer Networks (LCN)10.1109/LCN52139.2021.9525008(170-177)Online publication date: 4-Oct-2021
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    cover image ACM Conferences
    WPES '10: Proceedings of the 9th annual ACM workshop on Privacy in the electronic society
    October 2010
    136 pages
    ISBN:9781450300964
    DOI:10.1145/1866919
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Publication History

    Published: 04 October 2010

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    Author Tags

    1. anonymity
    2. eclipse attack
    3. peer-to-peer
    4. selective denial of service
    5. shadowwalker

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    View all
    • (2024)Periscoping: Private Key Distribution for Large-Scale MixnetsIEEE INFOCOM 2024 - IEEE Conference on Computer Communications10.1109/INFOCOM52122.2024.10621274(681-690)Online publication date: 20-May-2024
    • (2023)On the (In)security of Peer-to-Peer Decentralized Machine Learning2023 IEEE Symposium on Security and Privacy (SP)10.1109/SP46215.2023.10179291(418-436)Online publication date: May-2023
    • (2021)WhisperChord: Scalable and Secure Node Discovery for Overlay Networks2021 IEEE 46th Conference on Local Computer Networks (LCN)10.1109/LCN52139.2021.9525008(170-177)Online publication date: 4-Oct-2021
    • (2021)GuardedGossip: Secure and Anonymous Node Discovery in Untrustworthy NetworksSecurity and Privacy in Communication Networks10.1007/978-3-030-90019-9_7(123-143)Online publication date: 3-Nov-2021
    • (2019)ConsenSGX: Scaling Anonymous Communications Networks with Trusted Execution EnvironmentsProceedings on Privacy Enhancing Technologies10.2478/popets-2019-00502019:3(331-349)Online publication date: 12-Jul-2019
    • (2014)Censorship-resistant and privacy-preserving distributed web search14-th IEEE International Conference on Peer-to-Peer Computing10.1109/P2P.2014.6934312(1-10)Online publication date: Sep-2014
    • (2014)Mitigating Eclipse attacks in Peer-To-Peer networks2014 IEEE Conference on Communications and Network Security10.1109/CNS.2014.6997509(400-408)Online publication date: Oct-2014
    • (2012)OctopusProceedings of the 2012 IEEE 32nd International Conference on Distributed Computing Systems10.1109/ICDCS.2012.78(325-334)Online publication date: 18-Jun-2012
    • (2012)Analyzing the Gold Star Scheme in a Split Tor NetworkSecurity and Privacy in Communication Networks10.1007/978-3-642-31909-9_5(77-95)Online publication date: 2012
    • (2011)PIR-TorProceedings of the 20th USENIX conference on Security10.5555/2028067.2028098(31-31)Online publication date: 8-Aug-2011

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