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Authors: Ivan Oleynikov 1 ; Elena Pagnin 2 and Andrei Sabelfeld 1

Affiliations: 1 Chalmers University, Gothenburg, Sweden ; 2 Lund University, Lund, Sweden

Keyword(s): Privacy, Proximity-Testing, Multi-Party Computation, Active Security.

Abstract: Proximity testing is at the core of several Location-Based Services (LBS). Despite a series of reported and confirmed abuses, modern LBSs still demand their clients to disclose their locations in plain in order to preform location proximity testing. This works aims at enhancing proximity testing with privacy. We design CatNap a novel protocol that (1) implements precise Euclidean distance matching; (2) allows matching even if the clients are not online at the same time (the “napping party” feature); (3) is secure against active adversaries (malicious actors that corrupt up to one party); (4) makes black-box use of generic Multi-Party Computation techniques (any future improvement of the underlying building blocks will also boost CatNap); and (5) is efficient: servers run with about 0.03 seconds of CPU time and 5.6MB of communication, while clients perform only a small number of Boolean operations and need just 51 bytes of communication.

CC BY-NC-ND 4.0

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Paper citation in several formats:
Oleynikov, I.; Pagnin, E. and Sabelfeld, A. (2022). CatNap: Leveraging Generic MPC for Actively Secure Privacy-enhancing Proximity Testing with a Napping Party. In Proceedings of the 19th International Conference on Security and Cryptography - SECRYPT; ISBN 978-989-758-590-6; ISSN 2184-7711, SciTePress, pages 237-248. DOI: 10.5220/0011279500003283

@conference{secrypt22,
author={Ivan Oleynikov. and Elena Pagnin. and Andrei Sabelfeld.},
title={CatNap: Leveraging Generic MPC for Actively Secure Privacy-enhancing Proximity Testing with a Napping Party},
booktitle={Proceedings of the 19th International Conference on Security and Cryptography - SECRYPT},
year={2022},
pages={237-248},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0011279500003283},
isbn={978-989-758-590-6},
issn={2184-7711},
}

TY - CONF

JO - Proceedings of the 19th International Conference on Security and Cryptography - SECRYPT
TI - CatNap: Leveraging Generic MPC for Actively Secure Privacy-enhancing Proximity Testing with a Napping Party
SN - 978-989-758-590-6
IS - 2184-7711
AU - Oleynikov, I.
AU - Pagnin, E.
AU - Sabelfeld, A.
PY - 2022
SP - 237
EP - 248
DO - 10.5220/0011279500003283
PB - SciTePress

- Science and Technology Publications, Lda.
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