Abstract: The Internet of Things implements information intelligence relying on the powerful data processing capability of cloud computing. However, it is not worthy of user trust that cloud computing manages data and services. According to cloud data security issues in the environment of the IoT, the cloud data storage security and privacy policies were raised,in order to ensure the accuracy and privacy of user data in the cloud. The experimental results show that the program is effective and flexible, and can resist the Byzantine failure, malicious modification of data, and even server collusion attack.

Key words: IoT, Cloud computing, Distributed database, Privacy protection