Cryptanalysis of a Protocol for Efficient Sorting on SHE Encrypted Data

Murthy, Shyam; Vivek, S. Sree

doi:10.1007/978-3-030-35199-1_14

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…We next show that the above method is insecure too. We use the technique from [11] to recover the difference 𝑑 𝑎 − 𝑑 𝑏 from 𝑧 alone with a good probability. The idea is to use the fact that every 𝑑 𝑎 and 𝑑 𝑏 , 0 ≤ |𝑑 𝑎 − 𝑑 𝑏 | ≤ 𝑚.…”

Section: Another Failed Attemptmentioning

confidence: 99%

Revisiting a Privacy-Preserving Location-based Service Protocol using Edge Computing

Upadhyaya

Vivek

2022

Proceedings of the 17th International Conference on Availability, Reliability and Security

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Location-based services are getting more popular day by day. Finding nearby stores, proximity-based marketing, on-road service assistance, etc., are some of the services that use location-based services. In location-based services, user information like user identity, user query, and location must be protected. Ma et al. (INFOCOM-BigSecurity 2019) proposed a privacy-preserving location-based service using Somewhat Homomorphic Encryption (SHE). Their protocol uses edge nodes that compute on SHE encrypted location data and determines the 𝑘-nearest points of interest contained in the Location-based Server (LBS) without revealing the original user coordinates to LBS, hence, ensuring privacy of users locations.In this work, we show that the above protocol by Ma et al. has a critical flaw. In particular, we show that their secure comparison protocol has a correctness issue in that it will not lead to correct comparison. A major consequence of this flaw is that straightforward approaches to fix this issue will make their protocol insecure. Namely, the LBS will be able to recover the actual locations of the users in each and every query. CCS CONCEPTS• Security and privacy → Privacy-preserving protocols.

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Section: Another Failed Attemptmentioning

confidence: 99%