Practices of backuping homomorphically encrypted databases

doi:10.1007/s11704-019-8394-8

Front. Comput. Sci.

2019, Vol. 13

Issue (2) : 220-230 https://doi.org/10.1007/s11704-019-8394-8

RESEARCH ARTICLE

Practices of backuping homomorphically encrypted databases

Sa WANG^1,²(

), Yiwen SHAO^1,², Yungang BAO^1,²

¹. SKL Computer Architecture, Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China
². University of Chinese Academy of Sciences, Beijing 100049, China

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Abstract

Ideal homomorphic encryption is theoretically achievable but impractical in reality due to tremendous computing overhead. Homomorphically encrypted databases, such as CryptDB, leverage replication with partially homomorphic encryption schemes to support different SQL queries over encrypted data directly. These databases reach a balance between security and efficiency, but incur considerable storage overhead, especially when making backups. Unfortunately, general data compression techniques relying on data similarity exhibit inefficiency on encrypted data. We present CryptZip, a backup and recovery system that could highly reduce the backup storage cost of encrypted databases. The key idea is to leverage the metadata information of encryption schemes and selectively backup one or several columns among semantically redundant columns. The experimental results show that CryptZip could reduce up to 90.5% backup storage cost on TPC-C benchmark.

Keywords homomorphic encryption security deduplication

Corresponding Author(s): Sa WANG

Just Accepted Date: 31 January 2019 Online First Date: 26 March 2019 Issue Date: 08 April 2019

Cite this article:

Sa WANG,Yiwen SHAO,Yungang BAO. Practices of backuping homomorphically encrypted databases[J]. Front. Comput. Sci., 2019, 13(2): 220-230.

URL:

https://academic.hep.com.cn/fcs/EN/10.1007/s11704-019-8394-8
https://academic.hep.com.cn/fcs/EN/Y2019/V13/I2/220

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