Efficient key management for IOT owner in the cloud

IOT (internet of things) owner may not want their sensitive data to be public in the cloud. However, the client operated by IOT owner may be too lightweight to provide the encryption/decryption service. To remove the issue, we propose a novel solution to minimize the access control cost for IOT owner. First, we present a security model for IOT with minimal cost of IOT owner client without encryption, in which we transfer the encryption/decryption from the client to the cloud. Second, we propose an access control model to minimize the key management cost for IOT owner. Third, we provide an authorization update method to minimize the cost dynamically. In our method, the sensitive data from IOT owner is only available to the authorized user. Each IOT owner needs only to manage a single password, by which the IOT owner can always manage his/her sensitive data and authorization no matter the authorization policy how to change. Experimental results show that our approach significantly outperforms most of existing methods with efficient key management for IOT owner.