Nowadays, Internet of Things (IoT) is being achieved significant improvement in the scientific community. Both industry and academia are concentrated on the concepts of improving security, maintainability and utility through the improvement and standardization of optimal practices. There are various existing approaches are arisen in the security of IoT, ranging from cryptography to network security for identifying management. Thus, this paper focused on the security due to its impacts of limiting factors to adoption of wider IoT. This paper discusses the survey of various existing approaches suitable for IoT environment in the domain of authentication and authorization. Hence, this survey analyzes various techniques corresponding to authentication and authorization for IoT devices. This study is to utilize 25 research papers concentrated on various techniques and the review of researches technique-wise is to be provided. Finally, the survey will encourage the analysis based on the publication year, research methodology, performance metrics, and achievement of the research techniques toward authentication and authorization for IoT devices, as well as the journals. Finally, the research gaps and difficulties with the methodologies will be highlighted. Furthermore, the motive for establishing an effective approach for authentication and authorisation in IoT device techniques will be disclosed.

In this research, we proposed a protocol for information transmission in a communication system. The protocol consists of three parts: Publisher, Broker, and Subscriber. The main problem in the transmission is the reliability of the broker. It is very difficult to get the status of the broker whether it is active or not. Secondly, we also worked on the part of security.Here by employing a Watchdog timer to determine whether the broker is active or not. To make the system more secure AES algorithm is incorporated into it. To validate the suggested protocol hardware setup is built and performance is tested in various conditions. Performance tests show that our proposed system outperforms the current system when compared to the existing system. The suggested system architecture's temporal and spatial complexity are also presented in this research.