Internet of things (IoT) is a collection of objects, services and devices which are connected via a network and can communicate and share information to achieve a common goal in different areas and applications. {4} In other words it is a technological revolution which represents the future of computing, communications and its development in upcoming days depends on the innovation of dynamic technology from wireless sensor to nanotechnology. {15} The architecture of IoT mainly based on two things. One is data communication tools and another one is radio frequency identification (RFID). {15} IoT can be implemented in different field such as agriculture, healthcare, distribution etc. The purpose of IoT is to perform daily tasks and responsibilities by using intelligent devices for changing humans’ usual lifestyle. {4} Devices used in IoT are arranged with sensors and processing power which qualify them that to be fitted in many environments. {1} Fig.1 is a representation of some common applications of IoT in different environments such as smart healthcare, wearable technology, smart home, smart transport etc. Services provided by IoT applications is a blessing of modern technology as it provides great benefit for humans’ life. As every advantage have some disadvantage like that those benefits have some security and privacy concern. {1} In recent years IoT applications have a huge expansion due to the rapid development of technology especially in Radio Frequency Identification (RFID) and Wireless Sensor Network (WSN). {4} The RFID enables the tagging or labeling of every single device. On the other hand, due to WSN people, devices, objects etc. becomes a wireless recognizable object and can communicate with each other in the physical, cyber and virtual world. {4}

The rest of this paper is organized as follows. Section II describes the architecture of IoT. In section III, the security and issues of different security principles and IoT devices are presented. The section also contains the security issues that are associated with each layer of IoT. Section IV discusses the application of IoT in different sectors. Section V gives the big picture of comparison and criticism of existing research work of IoT. Finally, the paper is concluded in Section VI.

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