Keyword Searchable Encryption Scheme based on Blockchain in Cloud Environment

With the development of cloud computing, a large amount of sensitive data information is often stored on cloud servers in the form of ciphertext, thereby alleviating local storage pressure while ensuring data privacy. Although encryption helps protect the confidentiality of the data, a secure and efficient search of ciphertext data is a challenging issue. Aiming at the problems of searchable encryption schemes in the existing cloud environment, such as low search efficiency and accuracy, and poor security, this paper proposes a traceable, keyword searchable encryption scheme based on blockchain technology. This solution makes use of the advantages of the non-tampering and non-repudiation of the blockchain to store query records on the blockchain, thereby achieving traceability of user queries and preventing illegal users from leaking sensitive data. Finally, under the random oracle model, the scheme is proved to be adaptive and indistinguishable. Through comparative analysis, it is shown that the scheme has high search accuracy and security.