Key escrow-free secure multi-keyword sorting and searching system

Abstract

The invention relates to a key escrow-free secure multi-keyword sorting and searching system. The system comprises a key generation center, a cloud server, a data owner and a data user; the key generation center is used for achieving interactive computing with the cloud server to jointly generate a public parameter of the system and a property public key-private key pair of the data user; the cloud server is used for storing a file of the data owner and responding to a searching query request of the data user; the data owner extracts a keyword set from the file, encrypts the keyword set into asecure index, encrypts the file, makes an access strategy and embeds the access strategy into ciphertext; and the data user defines the searched keyword set and generates a trap door by using the property private key of the data user to search for the encrypted file stored in the cloud server. According to the system, the key escrow problem is solved, flexible authorization keyword searching andfine-grained data access authorization are achieved, multi-keyword subset searching is supported, and the searching result is not influenced by changes of the keyword query order.

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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