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Distance computation using homomorphic encryption for location-based services: A quantitative evaluation of homomorphic encryption in privacy-preserving location-based services
University of Skövde, School of Informatics.
2025 (English)Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesisAlternative title
Distansberäkning med homomorf kryptering för platsbaserade tjänster : En kvantitativ utvärdering av homomorf kryptering i integritetsskyddade platsbaserade tjänster (Swedish)
Abstract [en]

Location-based services (LBS) require a user’s coordinates to perform calculations. This introduces privacy risks as data needs to be decrypted in order for computations to be performed. This study explores homomorphic encryption (HE) as a method to enable these computations without the need for decryption. In this study, we develop an application with the Node-seal library to perform homomorphic encryptions and computations. Due to HE’s mathematical constraints, a Euclidean formula is used instead of more precise models such as Karney’s formula. We then perform a quantitative study on a large dataset of randomized coordinates where encrypted computation time and precision is compared against plaintext computation time, and distance computations are compared against Karney’s formula. The results show that computation time increases significantly for encrypted computations, but the precision and relative deviation from Karney’s formula were found to be within acceptable bounds for certain LBS scenarios. Future work may explore alternative HE libraries and support for more complex geodetic distance formulas.

Place, publisher, year, edition, pages
2025. , p. 57
Keywords [en]
Homomorphic encryption, location-based services, privacy, Microsoft SEAL
National Category
Information Systems, Social aspects
Identifiers
URN: urn:nbn:se:his:diva-25298OAI: oai:DiVA.org:his-25298DiVA, id: diva2:1973287
Subject / course
Informationsteknologi
Educational program
Web Developer - Programming
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Available from: 2025-06-19 Created: 2025-06-19 Last updated: 2025-09-29Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • apa-cv
  • ieee
  • modern-language-association-8th-edition
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