Index Obfuscation for Oblivious Document Retrieval in a Trusted Execution Environment
Index Obfuscation for Oblivious Document Retrieval in a Trusted Execution Environment
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DOI：
10.1145/3340531.3412035
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Jinjin Shao;Shiyu Ji;A. O. Glova;Yifan Qiao;Tao Yang;T. Sherwood
中科院分区：
文献类型：
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作者：
Jinjin Shao;Shiyu Ji;A. O. Glova;Yifan Qiao;Tao Yang;T. Sherwood
针对Intel SGX等可信硬件执行环境，研究了面向多关键字文档搜索的隐私感知倒排索引设计和文档检索技术。以前的工作使用耗时的不经意计算技术来避免在这样的环境中隐私保护的内存访问模式的泄漏。本文提出了一种效率增强的设计方案，该方案利用发布分词和文档ID掩蔽来混淆倒排索引结构，目的是隐藏文档-术语关联，避免访问模式泄漏。基于这样一种索引，描述了在线查询处理过程中的隐私感知不经意文档检索。同时提供了隐私和效率分析，然后评估结果比较了多基线建议的设计。
This paper studies privacy-aware inverted index design and document retrieval for multi-keyword document search in a trusted hardware execution environment such as Intel SGX. The previous work uses time-consuming oblivious computing techniques to avoid the leakage of memory access patterns for privacy preservations in such an environment. This paper proposes an efficiency-enhanced design that obfuscates the inverted index structure with posting bucketing and document ID masking, which aims to hide document-term association and avoid the access pattern leakage. This paper describes privacy-aware oblivious document retrieval during online query processing based on such an index. Both privacy and efficiency analyses are provided, followed by evaluation results comparing proposed designs with multiple baselines.