Third-Party Private Set Intersection

Foo Yee Yeo; Jason H. M. Ying

Paper 2023/685

Third-Party Private Set Intersection

Foo Yee Yeo

Jason H. M. Ying

Abstract

Private set intersection (PSI) enables two parties, each holding a private set to compute their intersection without revealing other information in the process. We introduce a variant of conventional PSI termed as third-party PSI, whereby the intersection output of the two parties is only known to an inputless third party. In this setting, the two parties who participate in the protocol have no knowledge of the intersection result or any information of the set content of the other party. In general, third-party PSI settings arise where there is a need for an external party to obtain the intersection outcome without leakage of additional information to any other party. This setting is motivated by an increasing importance in several real-world applications. We describe protocols which achieve this functionality with minimal communication overhead. To the best of knowledge, our work is the first of its kind to explore this variant of PSI.

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Published elsewhere. 2023 IEEE International Symposium on Information Theory (ISIT)
Keywords: private set intersection PSI
Contact author(s): fooyee yeo @ seagate com
jasonhweiming ying @ seagate com
History: 2023-06-26: last of 2 revisions; 2023-05-15: received; See all versions
Short URL: https://ia.cr/2023/685
License: CC BY-NC-ND

BibTeX

@misc{cryptoeprint:2023/685,
      author = {Foo Yee Yeo and Jason H. M. Ying},
      title = {Third-Party Private Set Intersection},
      howpublished = {Cryptology ePrint Archive, Paper 2023/685},
      year = {2023},
      note = {\url{https://eprint.iacr.org/2023/685}},
      url = {https://eprint.iacr.org/2023/685}
}