Single-server Multi-user Private Information Retrieval with Side Information
Single-server Multi-user Private Information Retrieval with Side Information
复制标题
带辅助信息的单服务器多用户隐私信息检索
DOI:
10.1109/isit.2018.8437545
复制
发表时间:
2018
期刊:
影响因子:
--
通讯作者:
M. Gastpar
中科院分区:
文献类型:
--
作者:
Su Li;M. Gastpar
In the problem of private information retrieval with side information, a single user wants to recover one of the $K$ independent messages which are stored at one or multiple servers. The user initially has a subset of messages as side information. The goal of the user is to retrieve the demand message by using minimum number of transmissions $(R^{\ast})$ from the server(s) to the user under the condition that the index of the demand message should not be inferred by the server. We introduce the multi-user variant into this problem, where each user wants to retrieve one message and has a subset of messages as side information. In this paper, we study the special cases where all users want to retrieve one common message from a single server, but each user has different side information messages. We show that the optimal coding scheme can be constructed by first optimally partitioning the messages and then generating MDS codes separately in each subset of messages in the partition. We determine the $R^{\ast}$, propose algorithms to compute $R^{\ast}$, and construct optimal linear coding schemes with complexity polynomial in $K$ (but exponential in the number of side information messages).
影响因子:
2.5
作者:
Hua Sun;S. Jafar
通讯作者:
Hua Sun;S. Jafar