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The Research Of Public Key Encryption With Keyword Search

Posted on:2021-04-06Degree:MasterType:Thesis
Country:ChinaCandidate:Z H LiFull Text:PDF
GTID:2428330620463238Subject:Computer software and theory
Abstract/Summary:PDF Full Text Request
With the continuous development and improvement of cloud computing technology,more and more users and enterprises encrypt and upload data to the cloud,and process the data through the cloud server,so as to reduce the local computing and storage costs.The public key encryption with keyword search does not decrypt the message and keywords.Firstly,the sender uploads the encrypted keywords and data to the cloud server,then the receiver sends a trapdoor containing keywords to the cloud server,finally the cloud server realizes the data retrieval function.However,the cloud server is not completely trusted,the keyword faces many attacks,one of which is off-line keyword guessing attack.In this paper,we improve the keyword search system and its related system.The certificateless keyword search scheme is a combination of certificateless key system and keyword search system.In this paper,we first make a deep research on the certificateless keyword search scheme.And find that the previous scheme can not resist the keyword guessing attack by malicious cloud server.By authorizing and authenticating the sender and generating the private key,the cloud server can not generate the legal key ciphertext,thus filling the security hole.Secondly,in order to resist the keyword guessing attack of the server,in the existing scheme,the trapdoor of the receiver must contain the sender's information(identity or public key).This paper makes up for the defect and designs two schemes that do not need to assign the sender in advance,one of which can resist honest and curious cloud server,the other can resist malicious cloud server.Finally,we also design a decryptable attribute-based keyword search scheme,which can resist keyword guessing attack and does not need secure channel in trapdoor transmission,and design a specific application example-telemedicine.
Keywords/Search Tags:keyword search, keyword guessing attack, certificateless, attribute-based, telemedicine
PDF Full Text Request
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