Retrieval system of encrypted data in secure cloud storage

Abstract

The invention relates to a retrieval system of encrypted data in secure cloud storage. The retrieval system comprises a key generation center used for managing and distributing a public key / private key generated in the system; a cloud platform used for providing a data storage service to a data owner and responding to a search request of a user, that is, a data owner encrypts the data by utilizingthe public key and sends the encrypted data to the cloud platform for storage; and the user generates a query trap door and sends the query door to the cloud platform so as to search the encrypted data; and a calculation service provider for providing an online calculation service and interacting with the cloud platform to carry out calculation. The retrieval system of encrypted data in secure cloud storage supports multiple search and query modes; the system allows the user to search the encrypted documents from multiple data owners by utilizing one query trap door and supports flexible userauthorization and revocation mechanisms; and the system prevents offline keyword guessing attacks.

Description

technical field [0001] The present invention relates to an encrypted data retrieval system in secure cloud storage. Background technique [0002] Outsourced data storage services allow companies and organizations to store large amounts of data in cloud servers, saving capital investment for deploying and managing local storage infrastructure. With the increase of data leakage problems, data stored in cloud servers has data security and privacy issues, and data owners will encrypt data before outsourcing storage. Due to the unreadability of ciphertext, encryption technology hinders user search queries on encrypted data. Searchable encryption technology can support users to search for keywords on encrypted data, and has received extensive attention from academia and industry. In searchable encryption, users generate keyword-based query trapdoors and send the trapdoors to cloud servers. The cloud server executes the test algorithm to retrieve all encrypted documents that mee...

AI Technical Summary

Problems solved by technology

Existing searchable encryption systems are not perfect, and they have the following disadvantages: First, existing systems are constructed based on different principles, so they cannot support multiple query modes at the same time

In 2008, Ohtaki studied the Boolean query paradigm of encrypted data, which uses the Bloom filter to encrypt the keyword index. Although this shortens the comparison time, there is an error probability in the returned results.

Cash et al. proposed a highly scalable searchable encryption scheme, which supports concatenated keyword searches and Boolean queries, but it leaks data access patterns for higher efficiency

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