∑oφoς: Forward Secure Searchable Encryption

Raphael Bost
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引用次数: 265

Abstract

Searchable Symmetric Encryption aims at making possible searching over an encrypted database stored on an untrusted server while keeping privacy of both the queries and the data, by allowing some small controlled leakage to the server. Recent work shows that dynamic schemes -- in which the data is efficiently updatable -- leaking some information on updated keywords are subject to devastating adaptative attacks breaking the privacy of the queries. The only way to thwart this attack is to design forward private schemes whose update procedure does not leak if a newly inserted element matches previous search queries. This work proposes Sophos as a forward private SSE scheme with performance similar to existing less secure schemes, and that is conceptually simpler (and also more efficient) than previous forward private constructions. In particular, it only relies on trapdoor permutations and does not use an ORAM-like construction. We also explain why Sophos is an optimal point of the security/performance tradeoff for SSE. Finally, an implementation and evaluation results demonstrate its practical efficiency.
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∑oφoς: Forward Secure Searchable Encryption
可搜索对称加密旨在实现对存储在不受信任的服务器上的加密数据库的搜索,同时通过允许对服务器进行一些小的可控泄漏来保持查询和数据的隐私。最近的研究表明,动态方案——其中的数据是可有效更新的——在更新的关键字上泄露一些信息,容易受到破坏性的自适应攻击,从而破坏查询的隐私。阻止这种攻击的唯一方法是设计转发私有方案,如果新插入的元素与以前的搜索查询匹配,则该方案的更新过程不会泄漏。这项工作提出Sophos作为一个向前私有SSE方案,其性能与现有的不太安全的方案相似,并且在概念上比以前的向前私有结构更简单(也更有效)。特别是,它只依赖于活板门排列,而不使用类似oram的结构。我们还解释了为什么Sophos是SSE安全/性能权衡的最佳点。最后,通过实施和评价结果验证了该方法的实际有效性。
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