隐私保护密文检索技术研究进展

Advances in Privacy-Preserving Ciphertext Retrieval

密文检索技术旨在提供密态数据查询服务,提高密文数据的可用性。但目前大多数机制仍存在不同程度的额外信息泄露,容易被攻击者捕获用于恢复明文信息与查询条件。如何强化密文检索中的隐私保护特性,实现信息泄露最小化已成为研究者关注的重点目标。近年来,随着硬件芯片技术与新型密码技术的快速发展,隐私保护密文检索研究方面涌现出了一批新成果,该文主要围绕多样化密文检索、基于可信执行环境的密文检索、隐匿信息检索等研究热点展开阐述,并总结了未来发展趋势。

The ciphertext retrieval techniques are designed to provide query services over encrypted data and to improve the availability of encrypted data.However,most of existing methods leak additional information besides the query result,which may be utilized by the attacker to recover plaintext data or queries.How to enhance the privacy-preserving features in ciphertext retrieval and achieve the minimisation of information leakage has received a lot of attention from researchers.In recent years,with the rapid development of hardware chip technology and new cryptographic technology,a number of novel methods were proposed for privacy-preserving ciphertext retrieval.This paper mainly focuses on the research hotspots of diversified ciphertext retrieval,ciphertext retrieval based on trusted execution environment and private information retrieval,and summarizes the future development trends.