Analysis of Data Encryption Mechanisms for Searchable Encryption

손정갑; 양유진; Heekuck Oh; Sangjin Kim

Journal of The Korea Society of Computer and Information

Abbr : JKSCI
2013, 18(9), pp.79-89
Publisher : The Korean Society Of Computer And Information
Research Area : Computer Science

손정갑 ¹, 양유진 ², Heekuck Oh ³, Sangjin Kim ⁴

¹한양대학교
²한국기술교육대학교 컴퓨터공학부
³한양대학교
⁴한국기술교육대학교

ABSTRACT

Recently, the need for outsourcing sensitive data has grown due to the wide spreading of cost-effective and flexible cloud service. However, there is a fundamental concern in using such service since users have to trust external servers. Therefore, searchable encryption can be a very valuable tool to meet the security requirements of data outsourcing. However, most of work on searchable encryption focus only on privacy preserving search function and relatively lacks research on encryption mechanism used to actually encrypt data. Without a suitable latter mechanism, searchable encryption cannot be deployed in real world cloud services. In this paper,we analyze previously used and possible data encryption mechanisms for multi-user searchable encryption system and discuss their pros and cons. Our results show that readily available tools such as broadcast encryption, attribute-based encryption, and proxy re-encryption do not provide suitable solutions. The main problem with existing tools is that they may require separate fully trusted servers and the difficulty in preventing collusion attacks between outsiders and semi-trusted servers.
KEYWORDS

searchable encryption, broadcast encryption, attribute-based encryption, proxy re-encryption
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