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Design And Implementation Of Blockchain Application Platform Based On Keyword Attributed-based Encryption

Posted on:2021-02-25Degree:MasterType:Thesis
Country:ChinaCandidate:J H KangFull Text:PDF
GTID:2428330629952425Subject:Software engineering
Abstract/Summary:PDF Full Text Request
In recent years,with the advent of the era of big data,a growing number of users choose to store a large amount of data in the cloud,so that computers will not be stuck due to the occupation of local resources.Cloud storage has become an important means of information interaction.However,the transparency of network information makes privacy,authenticity and accuracy of data to face serious threats.Nowadays,people pay more and more attention to the privacy and authenticity of user data.How to ensure that the data on the cloud plateform can't be tampered with has become an urgent problem to be solved.Blockchain is a decentralized distributed ledger with the characteristics of transparency,openness and non-tampering.Using cryptography algorithm,combining blockchain and cloud computing,is the main way to solve the problem of privacy protection of cloud data.This thesis first proposes attributed-based encryption with keyword search scheme in cloud storage environment.In this paper,by introducing the public and private key pair of the server and the identity of the server and the sender,the scheme enables the receiver to resist the internal attack of off-line keyword guessing.When the receiver generated the trapdoor for the server,it doesn't need to designate the sender.By integrating attribute based encryption scheme,a one to many encryption scheme with keyword search property is realized.This scheme outsources ciphertext on cloud platform.In order to prevent semi-trusted the cloud platform from modifying relevant data,the access policy is stored on the blockchain.Finally,a fine-grained access control platform with searchable property is designed based on the proposed encryption scheme with keyword search property.
Keywords/Search Tags:Blockchain, attributed-based encryption, Cloud storage, keyword guessing attack
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