Journal of Xidian University ›› 2021, Vol. 48 ›› Issue (6): 212-220.doi: 10.19665/j.issn1001-2400.2021.06.026

• Computer Science and Technology • Previous Articles    

Private information retrieval with low encoding/decoding complexity

DAI Mingjun(),LI Xiaofeng(),DENG Haiyan(),CHEN Bin()   

  1. School of Electronic and Information Engineering,Shenzhen University,Shenzhen 518060,China
  • Received:2020-08-24 Online:2021-12-20 Published:2022-02-24

Abstract:

Most of current private information retrieval methods are based on linear combination operations,and these methods have a high computational complexity.To solve this problem,this paper proposes a private information retrieval scheme based on CP-BZD (combination property,binary zigzag decoding) code and zigzag decoding.In the (n,k) CP-BZD system,k original source packets are encoded into nk packets,where arbitrary k packets are able to recover the original k source packets,and the decoding can use the zigzag decoding algorithm.The user wants to download a file from the distributed storage system.The file is encoded by CP-BZD code and stored on the node.There are no nodes colluding with each other in the system.The operation of the proposed scheme is based on the binary shift and addition operation,whose computational complexity is lower than that of linear multiplication and matrix inversion.The communication cost has reached the lowest threshold proposed in the existing papers.This scheme is suitable for an arbitrary (n,k) system,and the computational complexity and communication cost are low.The scheme is of great significance in private information retrieval.

Key words: distributed storage, private information retrieval, CP-BZD code, zigzag decode

CLC Number: 

  • TP391.3