A safe pair index construction and retrieval method capable of resisting keyword privacy disclosure

Abstract

The invention relates to a security pair index construction and retrieval method capable of resisting keyword privacy disclosure. The method comprises the following steps: constructing a security pairindex and retrieving the security pair index, and the security pair index construction comprises the following steps: S1, a data owner calculates a related score corresponding to each keyword according to a to-be-uploaded data document, calculates a real index and encrypts and accesses a keyword pair set; S2, the data owner calculates a false index and a mixed index through a real index, encryptsthe false index and the mixed index by using an authorization secret key, and obtains a safe pair index by combining an access keyword pair set; S3, the data owner encrypts the to-be-uploaded data document to obtain a ciphertext document set; S4, the data owner uploads the security pair index and the ciphertext set to the cloud server. According to the method and the device, keyword privacy leakage caused by an access mode and a search mode based on keywords can be resisted.

Description

technical field [0001] The invention belongs to the technical field of searchable encryption in cloud computing security, and specifically relates to a security pair index structure and a retrieval method for anti-keyword privacy leakage. Background technique [0002] In the context of the era of big data, both individual users and large organizations have more and more data, such as the medical data generated by medical smart devices 24 hours a day or the daily Purchase and sales records result in serious shortage of local storage space for users. Based on cloud computing technology and network communication technology, cloud service providers concentrate a large number of computing resources and storage resources. Users with limited resources only need to pay a certain fee to the cloud service provider to easily use the computing and storage services provided by the cloud service provider. [0003] Due to the low cost of storage resources brought by cloud storage service...

AI Technical Summary

Problems solved by technology

However, the determinism of search results still cannot prevent attackers from using data users' search patterns to obtain access keyword information.

[0015] Currently, the literature Liu C, Zhu L H, Wang M, and Tan Y-a. Search pattern leakage insearchable encryption: Attacks and new construction [J]. Information Sciences, vol.265, pp.176-188, 2014. Formally proposed the search pattern specific attack model, and gave two specific solutions (RDBC and RSBC), but the larger the segmentation factor l in this scheme, the lower the efficiency of the scheme, and the scheme is still from the perspective of access mode Keyword privacy will be leaked

[0016] Therefore, most of the current searchable encryption schemes based on keywords mainly resist keyword privacy leakage from the perspective of ciphertext indistinguishability and trapdoor indistinguishability for the sake of search efficiency. The security of these schemes has been greatly restricted due to the consideration of keyword privacy leakage in both the acquisition mode and the search mode.

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