Multi-keyword Search Based on Attribute Encryption

摘要

To address the problems of key leakage and large computation amount in current attribute-based searchable encryption (SE) schemes, this study proposes a multi-keywords ranked search scheme based on attribute encryption in cloud environment. Firstly, the scheme not only supports fine-grained search authorisation, but also has constant ciphertext length. Secondly, users' private keys are blinded before being submitted to the cloud server, This process ensures the security and confidentiality of users' keys. Thirdly, to reduce search complexity, this study uses TF × IDF rules to calculate the relevance scores of documents and given keywords, and then sorts the documents. Lastly, formal evidence shows that our scheme exhibits selective plaintext security and is indistinguishably secure against chosen keyword attacks. Experimental results demonstrate that our scheme is efficient.