A secure multi-keyword ranking and retrieval system without key escrow

Abstract

The invention relates to a secure multi-keyword sorting and retrieval system without key trusteeship, including: a key generation center, which is used for interactive calculation with a cloud server to jointly generate public parameters of the system and attribute public / private keys of data users Yes; the cloud server is used to store the files of the data owner and respond to the search query request of the data user; the data owner extracts the keyword set from the file and encrypts it into a security index, encrypts the file at the same time, formulates access policies and embeds them in the ciphertext ; Data user, define a set of search keywords, use the attribute private key of the data user to generate a trapdoor to search the encrypted files stored in the cloud server. The invention solves the key trusteeship problem, realizes flexible authorized keyword search, realizes fine-grained data access authorization, supports multi-keyword subset search, and the order change of query keywords does not affect search results.

Description

technical field [0001] The invention relates to the technical field of retrieval, in particular to a secure multi-keyword sorting retrieval system without key trusteeship. Background technique [0002] With the development of new computing models, cloud computing has become a technology that people are most concerned about. It can use shared resources to provide high-quality on-demand services. Therefore, more and more companies and individuals tend to outsource data storage to Cloud Server. Although cloud computing has huge economic and technical advantages, users' concerns about security and privacy issues have become prominent problems that hinder the widespread application of data storage in public cloud infrastructure. Encryption is the basic method to protect the privacy of remote storage data. However, due to the unreadability of ciphertext, how to effectively conduct keyword search on ciphertext becomes more difficult. Searchable encryption (SE) is an important mec...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems of key escrow in the existing authorized searchable encryption system, inflexible retrieval methods, high computing overhead for user's mobile terminal to retrieve and decrypt confidential files, low user recall efficiency, and inability to track malicious users, the present invention provides The secure multi-keyword sorting and retrieval system of key escrow realizes flexible authorized keyword search: the system realizes fine-grained data access authorization and supports multi-keyword subset search

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