Research On Attribute-based Encryption Algorithm With Multi-keyword Searchable And Testable

For the sake of protecting the privacy of individuals,enterprises and countries,the data owners must encrypt important data before uploading to the cloud server.The attribute-based encryption is a fine-grained access control mechanism that effectively protects users’ privacy and data security.With the need for data sharing,the emergence of searchable encryption solves the problem of how to quickly find the target ciphertext in a large amount of dataset,while the attribute revocation ensures the user’s access rights.The outsourcing technology and equality test mechanism provide effective help for terminals with limited local resources.At present,many attribute-based encryption schemes are difficult to implement flexible data sharing in algorithm functions,and the computing and storage capabilities of terminal devices are limited,which is insufficient to bear the complicated computing burden.Therefore,on the basis of attribute-based encryption scheme,it is meaningful to research multi-keyword search,attribute revocation,outsourced computing and equality test mechanism.In this paper,from the perspective of practical application,to solve the existing issues of attribute-based encryption schemes,attribute-based encryption algorithm with multi-keyword searchable and testable is researched,and the following results are abtained:(1)We construct an attribute-based encryption scheme that supports multi-keyword search and attribute revocation in a cloud storage environment.The scheme achieves multi-keyword search,the data owner extracts multiple keywords in the file to generate an index,and the data user generates a search token for a set of interested keywords accordingly,so that the ciphertext search is more accurate.Due to the cloud server only operates on the ciphertext,the privacy of the data is protected.The change of the attribute version number ensures the access content of different data users.Moreover,based on the assumption of DL and DDH,our scheme proves that has chosen-keyword security,chosen-plaintext security and token privacy security.(2)We construct a ciphertext-policy attribute-based encryption and equality test scheme in the Internet of Things(IoT).In order to reduce the local computing load and storage burden,most of the calculations in the scheme are outsourced to the server,it is suitable for resource-constrained IoT devices.The adoption of the equality test mechanism enables the authorized cloud server to determine whether two ciphertexts encrypted by different access policies contain the same plaintext without decrypting the ciphertext,avoiding repeated operations of the terminal devices,which is beneticial to ciphertext classification and precise decryption.Moreover,based on the decisional q-1 assumption,our scheme proves that has chosen-plaintext security.