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Multi-party Updatable Delegated Private Set Intersection

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Financial Cryptography and Data Security (FC 2022)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 13411))

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Abstract

With the growth of cloud computing, the need arises for Private Set Intersection protocols (PSI) that can let parties outsource the storage of their private sets and securely delegate PSI computation to a cloud server. The existing delegated PSIs have two major limitations; namely, they cannot support (1) efficient updates on outsourced sets and (2) efficient PSI among multiple clients. This paper presents “Feather”, the first lightweight delegated PSI that addresses both limitations simultaneously. It lets clients independently prepare and upload their private sets to the cloud once, then delegate the computation an unlimited number of times. We implemented Feather and compared its costs with the state of the art delegated PSIs. The evaluation shows that Feather is more efficient computationally, in both update and PSI computation phases.

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Acknowledgments

Aydin Abadi was supported in part by REPHRAIN: The National Research Centre on Privacy, Harm Reduction and Adversarial Influence Online, under UKRI grant: EP/V011189/1. Steven J. Murdoch was supported by REPHRAIN and The Royal Society under grant UF160505. This work was also partially funded by EPSRC Doctoral Training Grant studentship and EPSRC research grants EP/M013561/2 and EP/N028198/1.

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Authors and Affiliations

  1. University College London, London, UK

    Aydin Abadi & Steven J. Murdoch

  2. Newcastle University, Newcastle upon Tyne, UK

    Changyu Dong

  3. University of Strathclyde, Glasgow, UK

    Sotirios Terzis

Authors
  1. Aydin Abadi
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  2. Changyu Dong
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  3. Steven J. Murdoch
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  4. Sotirios Terzis
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Correspondence to Aydin Abadi .

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Editors and Affiliations

  1. Technion - Israel Institute of Technology, Haifa, Israel

    Ittay Eyal

  2. Texas A&M University, College Station, TX, USA

    Juan Garay

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Abadi, A., Dong, C., Murdoch, S.J., Terzis, S. (2022). Multi-party Updatable Delegated Private Set Intersection. In: Eyal, I., Garay, J. (eds) Financial Cryptography and Data Security. FC 2022. Lecture Notes in Computer Science, vol 13411. Springer, Cham. https://doi.org/10.1007/978-3-031-18283-9_6

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  • DOI: https://doi.org/10.1007/978-3-031-18283-9_6

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