Abstract
The emergence of the cloud storage has brought great convenience to people’s life. Many individuals and enterprises have delivered a large amount of data to the third-party server for storage. Thus, the privacy protection of data retrieved by the user needs to be guaranteed. Searchable encryption technology for the cloud environment is adopted to ensure that the user information is secure with retrieving data. However, most schemes only support single-keyword search and do not support file updates, which limit the flexibility of the scheme. To eliminate these problems, we propose a blockchain-enabled public key encryption scheme with multi-keyword search (BPKEMS), and our scheme supports file updates. In addition, smart contract is used to ensure the fairness of transactions between data owner and user without introducing a third party. At the data storage stage, our scheme realizes the verifiability by numbering the files, which ensures that the ciphertext received by the user is complete. In terms of security and performance, our scheme is secure against inside keyword guessing attacks (KGAs) and has better computation overhead than other related schemes.
Highlights
Cloud storage is a removable storage method that brings great convenience to people. erefore, the problem of data security is increasingly important
Internal cloud storage is located inside the corporate firewall, and users have independent storage control rights. ird, hybrid cloud storage provides both public cloud services and internal cloud services. e core is to meet the visits required by customers
Secure search usually refers to the effective search of encrypted data; to solve the problem of how to use the server to complete the secure keyword search when the encrypted data are stored in the cloud under the premise of incomplete trust, scholars proposed the searchable encryption (SE) as the core technology of secure search
Summary
Cloud storage is a removable storage method that brings great convenience to people. erefore, the problem of data security is increasingly important. When users upload data to cloud storage media, they need to solve the security problem of the data, and people often upload it after encryption. Secure search usually refers to the effective search of encrypted data; to solve the problem of how to use the server to complete the secure keyword search when the encrypted data are stored in the cloud under the premise of incomplete trust, scholars proposed the searchable encryption (SE) as the core technology of secure search. The calculation amount of public key SE is greater than that of symmetric SE, data owners and users do not need to pass the key negotiation before searching, which is more secure and has greater practical value. Erefore, it is very important to verify the correctness of the results [6] This scheme is static and cannot operate data dynamically. The blockchain mechanism is used to ensure the fairness of the transaction between data owner and user without a third party
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