A new approach to deanonymization of unreachable bitcoin nodes

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dc.contributor.author Mastan, Indra Deep
dc.contributor.author Paul, Souradyuti
dc.date.accessioned 2018-03-23T11:05:58Z
dc.date.available 2018-03-23T11:05:58Z
dc.date.issued 2018-03
dc.identifier.citation Mastan, Indra Deep and Paul, Souradyuti, “A new approach to deanonymization of unreachable bitcoin nodes”, arXiv, International Association for Cryptologic Research, DOI: Cryptology ePrint Archive: Report 2018/243, Mar. 2018. en_US
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/3549
dc.description.abstract Mounting deanonymization attacks on the unreachable Bitcoin nodes -- these nodes do not accept incoming connections -- residing behind the NAT is a challenging task. Such an attack was first given by Biryukov, Khovratovich and Pustogarov based on their observation that a node can be uniquely identified in a single session by their directly-connected neighbouring nodes (ACM CCS'15). However, the BKP15 attack is less effective across multiple sessions. To address this issue, Biryukov and Pustogarov later on devised a new strategy exploiting certain properties of address-cookies (IEEE S&P'15). Unfortunately, the BP15 attack is also rendered ineffective by the present modification to the Bitcoin client. In this paper, we devise an efficient method to link the sessions of unreachable nodes, even if they connect to the Bitcoin network over the Tor. We achieve this using a new approach based on organizing the block-requests made by the nodes in a Bitcoin session graph. This attack also works against the modified Bitcoin client. We performed experiments on the Bitcoin main network, and were able to link consecutive sessions with a precision of 0.90 and a recall of 0.71. We also provide counter-measures to mitigate the attacks. en_US
dc.description.statementofresponsibility by Indra Deep Mastan and Souradyuti Paul
dc.language.iso en en_US
dc.subject applications en_US
dc.subject Anonymity en_US
dc.subject Bitcoin en_US
dc.title A new approach to deanonymization of unreachable bitcoin nodes en_US
dc.type Preprint en_US
dcterms.publisher International Association for Cryptologic Research

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