Paper 2021/816 Original: eprint.iacr.org/2021/816 ↗
Privacy-Preserving Approximate k-Nearest-Neighbors Search that Hides Access, Query and Volume Patterns
Abstract
We study the problem of privacy-preserving approximate kNN search in an outsourced environment — the client sends the encrypted data to an untrusted server and later can perform secure approximate kNN search and updates. We design a security model and propose a generic construction based on locality-sensitive hashing, symmetric encryption, and an oblivious map. The construction provides very strong security guarantees, not only hiding the information about the data, but also the access, query, and volume patterns. We implement, evaluate efficiency, and compare the performance of two concrete schemes based on an oblivious AVL tree and an oblivious BSkiplist.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2021-06-16: last updated
- 2021-06-16: published
- Short URL
- https://ia.cr/2021/816
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2021/816,
author = {Alexandra Boldyreva and Tianxin Tang},
title = {Privacy-Preserving Approximate k-Nearest-Neighbors Search that Hides Access, Query and Volume Patterns},
howpublished = {Cryptology {ePrint} Archive, Paper 2021/816},
year = {2021},
url = {https://eprint.iacr.org/2021/816}
}