Ciphertext retrieval fair payment method and system based on block chain

Abstract

The invention relates to a ciphertext retrieval fair payment method and system based on a block chain. The system comprises a data owner, a data user, a cloud platform and an intelligent contract deployed on the block chain. The encrypted data of the data owner is authorized to more than one data user for retrieval and decryption through the smart contract; the data user can initiate a search request when an authorization condition is met and enough search cost is stored in the smart contract; and the smart contract verifies the correctness and integrity of the search results returned by the cloud server, and after the verification is passed, the cloud server returns k search results with the highest relevancy to the data user. The problem of fair payment can be further solved.

Description

technical field [0001] The invention relates to the technical field of searchable encryption and fair payment, in particular to a blockchain-based ciphertext retrieval fair payment method and system. Background technique [0002] With the development of cloud computing, more and more enterprises and individuals take advantage of this emerging technology to migrate a large amount of data and computing tasks to the cloud platform to save local storage and computing resources. While the cloud platform provides users with remote storage and computing services, the privacy issues of user data have gradually emerged. The cloud platform can access and use user data at any time without restriction. In order to guarantee security while ensuring data availability in the cloud platform, searchable encryption technology has become a research hotspot in cloud computing, which can simultaneously achieve the purpose of data confidentiality and information retrieval. However, most of the ...

AI Technical Summary

Problems solved by technology

However, there are certain limitations in relying on trusted third-party payment methods: a fully trusted party (such as a bank) needs to be introduced to handle payment issues fairly; trusted third parties may not have the ability to verify the correctness of search results or other outsourced computing operations ; The privacy of data owners and users may be leaked by a trusted third party

[0005] The current blockchain-based searchable encryption schemes use the built-in payment function of the blockchain to achieve fair payment. However, these schemes do not support multi-keyword search, top-k sorting, and publicly verifiable functions. Therefore, These solutions are not practical

Images