Paper 2021/1242 Original: eprint.iacr.org/2021/1242 ↗
Non-Interactive Differentially Anonymous Router
Abstract
A recent work by Shi and Wu (Eurocrypt'21) sugested a new, non-interactive abstraction for anonymous routing, coined Non-Interactive Anonymous Router (\NIAR). They show how to construct a \NIAR scheme with succinct communication from bilinear groups. Unfortunately, the router needs to perform quadratic computation (in the number of senders/receivers) to perform each routing. In this paper, we show that if one is willing to relax the security notion to $(\epsilon, \delta)$-differential privacy, henceforth also called $(\epsilon, \delta)$-differential anonymity, then, a non-interactive construction exists with subquadratic router computation, also assuming standard hardness assumptions in bilinear groups. Morever, even when $1-1/\poly\log n$ fraction of the senders are corrupt, we can attain strong privacy parameters where $\epsilon = O(1/\poly\log n)$ and $\delta = \negl(n)$.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2021-09-20: last updated
- 2021-09-20: published
- Short URL
- https://ia.cr/2021/1242
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2021/1242,
author = {Benedikt Bünz and Yuncong Hu and Shin’ichiro Matsuo and Elaine Shi},
title = {Non-Interactive Differentially Anonymous Router},
howpublished = {Cryptology {ePrint} Archive, Paper 2021/1242},
year = {2021},
url = {https://eprint.iacr.org/2021/1242}
}