Abstract
Nowadays, the development of the Internet of Things is growing rapidly. This condition raises security problems because of the many violations of security policies. In addition, the development of blockchain is also growing rapidly since it was first popularized in Bitcoin. Security issues on this IoT can be solved using blockchain. One way that can be done is to make secure communication between IoT devices. In this study, an IoT system will be created without and using blockchain which will then be compared between the two. The communication protocol used in IoT systems without blockchain is MQTT. Meanwhile, the blockchain platform used is Ethereum along with a smart contract. Both of these IoT systems will be analyzed for their security level by simulating attacks and observing their security aspects. The test results show that the IoT system based on blockchain technology has a higher level of security than the IoT system without blockchain technology.
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