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Smart cloud search services: verifiable keyword-based semantic search over encrypted cloud data

机译：智能云搜索服务：在加密的云数据上可验证的基于关键字的语义搜索

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摘要

With the increasing popularity of the pay-asyou- consume cloud computing paradigm, a large number of cloud services are pushed to consumers. One hand, it brings great convenience to consumers who use intelligent terminals; on the other hand, consumers are also facing serious difficulties that how to search the most suitable services or products from cloud. So how to enable a smart cloud search scheme is a critical problem in the consumer-centric cloud computing paradigm. For protecting data privacy, sensitive data are always encrypted before being outsourced. Although the existing searchable encryption schemes enable users to search over encrypted data, these schemes support only exact keyword search, which greatly affects data usability. Moreover, these schemes do not support verifiability of search result. In order to save computation cost or download bandwidth, cloud server only conducts a fraction of search operation or return a part of result, which is viewed as selfish and semi-honest-but-curious. So, how to enhance flexibility of encrypted cloud data while supporting verifiability of search result is a big challenge. To tackle the challenge, a smart semantic search scheme is proposed in this paper, which returns not only the result of keyword-based exact match, but also the result of keyword-based semantic match. At the same time, the proposed scheme supports the verifiability of search result. The rigorous security analysis and performance analysis show that the proposed scheme is secure under the proposed model and effectively achieves the goal of keywordbased semantic search.
机译：随着按需付费云计算范例的日益普及，大量的云服务被推向了消费者。一方面，它给使用智能终端的消费者带来了极大的便利。另一方面，消费者也面临着如何从云中搜索最合适的服务或产品的严重困难。因此，在以消费者为中心的云计算范例中，如何启用智能云搜索方案是一个关键问题。为了保护数据私密性，敏感数据在外包之前总是经过加密。尽管现有的可搜索加密方案使用户可以搜索加密的数据，但是这些方案仅支持精确的关键字搜索，这极大地影响了数据的可用性。而且，这些方案不支持搜索结果的可验证性。为了节省计算成本或下载带宽，云服务器仅执行搜索操作的一小部分或返回一部分结果，这被视为自私和半诚实但好奇的。因此，如何在支持搜索结果可验证性的同时提高加密云数据的灵活性是一个很大的挑战。针对这一挑战，本文提出了一种智能的语义搜索方案，该方案不仅返回基于关键词的精确匹配结果，而且还返回基于关键词的语义匹配结果。同时，所提出的方案支持搜索结果的可验证性。严格的安全性分析和性能分析表明，该方案在所提出的模型下是安全的，有效地达到了基于关键词的语义搜索的目的。

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