Abstract
The communication protocol is an important support to realize the communication between equipment and Internet. And it covers all aspects of the IoT (Internet of things) system. To address the security problem of forging or tampering of key data in traditional IoT protocols, this paper designs an improved MQTT (message queue telemetry transmission) protocol that uses blockchain technology to ensure the security of transmitted data in the process of data transmission. Because the information in the blockchain is not tamperable, which in turn ensures that data stored in brokers are not maliciously tampered with. Through simulation experiments, it is proved that this scheme is lightweight, efficient and easy to implement, which helps to protect the security of IoT data.
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