Paper 2018/851
More is Less: Perfectly Secure Oblivious Algorithms in the Multi-Server Setting
T-H. Hubert Chan and Jonathan Katz and Kartik Nayak and Antigoni Polychroniadou and Elaine Shi
Abstract
The problem of Oblivious RAM (ORAM) has traditionally been studied in the single-server setting, but more recently the multi-server setting has also been considered. Yet it is still unclear whether the multi-server setting has any inherent advantages, e.g., whether the multi-server setting can be used to achieve stronger security goals or provably better efficiency than is possible in the single-server case. In this work, we construct a perfectly secure 3-server ORAM scheme that outperforms the best known single-server scheme by a logarithmic factor. In the process we also show, for the first time, that there exist specific algorithms for which multiple servers can overcome known lower bounds in the single-server setting.
Metadata
- Available format(s)
- Publication info
- Published by the IACR in ASIACRYPT 2018
- Keywords
- oblivious RAMmuli-serverperfect security
- Contact author(s)
-
hubert @ cs hku hk
jkatz @ cs umd edu
nkartik @ vmware com
antigoni @ cornell edu
runting @ gmail com - History
- 2018-09-20: received
- Short URL
- https://ia.cr/2018/851
- License
-
CC BY