**Abstract**

A lot of communication are developed and advanced with different and heterogeneous communication techniques by integration of wireless and wire connection. Conventional technology is mainly focus on information technology based on computer techniques in the field of industry, manufacture and automation fields. It consists of individual skill and technique. As new technologies are developed and enhanced with conventional techniques, a lot of new application is emerged and merged with previous mechanism and skills. The representative application is internet of things services and applications. Internet of things is breakthrough technologies and one of the innovation industries which are called 4 generation industry revolution. Many different types of object and devices are embedded in sensor node. They are inter-connected with optimized open system interconnection protocol over internet, wireless and wire medium. Most of communication is fully inter-connected with conventional techniques at point to point and end to application in general. Most of information in internet of things is weak against attack. This may induce vulnerable features to unauthorized and outside attacker over internet protocol, Bluetooth, Wi-Fi, and so forth. As high and low efficient equipment are merged into heterogeneous infrastructure, IoT communication surroundings has become more complex, Due to limited resources in IoT such as small memory, low power and computing power, IoT devices are vulnerable and disclosed with security problems. In this chapter, we analyzed security challenges and threats based on smart home network under IoT service.

**Keywords:** Security issues, Vulnerability, Attack model, Internet of Things

## **1. Introduction**

IoT (The Internet of Things) is widespread, ubiquitous and becoming realized in the real world. Recently, a lot of smart sensor nodes and objects are interconnected and co-operated via the Internet protocol. The Internet of things, its devices and objects are regarded as a global network infrastructure by linking physical and virtual objects. It is implemented by the merging of data capture and communication capabilities in sensor node. IoT is used for connecting devices and sensors with small and limited resources devices to detect a lot of different devices. These kinds

#### **Figure 1.**

*Evolution of trend of IoT based on development of technology.*

of infrastructures and connectivity include existing and involving embedded sensor networks via Internet and network [1]. Recently, advanced technologies in the semiconductor enable cost effective solutions to integrate wireless sensor network and connect application with embedded processors and sensors [2]. Previous works are focused on the security mechanism and data transmission in wire and wireless sensor network. Most of the Internet of Things consist of with RFID (Radio frequency identification), sensor devices, WSN (Wireless sensor network), internet and other network, etc. Information security issues are occurred during transmission. It becomes more complicated, critical and essential problems. With a number of things, objects, sensors and actuators which is connected to the Internet, a massive and real-time data flow can be automatically connected with different protocols. Most of papers are focus on in the field of efficient and reliable mechanism of security engines. It includes many applications such as sensing, privacy, tracking, services, data modeling and protocols. The main and issues are security field because the conventional security algorithm and mechanism are not used and suitable for its application with restricted resources. To apply enhanced security and privacy, constrained devices and light-weight cryptography is required for optimal security mechanisms. Therefore, cryptography mechanisms and security protocols should be optimized to adapt constrained devices and objects or new design method to be applicable and integrating into related IoT system. Many researchers enhance try to enhance the security mechanism and schemes. They also tend to improve and develop security protocol with high speed hardware regardless of limited condition [3]. Y. W. Lim et al. proposed reduced hardware architecture and system-on-chip targeting sensor node to achieve energy efficient on the IoT healthcare sensor node. They focused on reduced hardware architecture including sensor node's power consumption and cost [4]. In addition, lightweight cryptography make an alternative idea to implement light-weight security algorithm with low computational and small capabilities. In general, IoT system should be analyzed by its original requirements such as heterogeneous, resource constraints and dynamic environment. It provides its requirement in the field of network, cloud, user, attacker, platform and service. Evolution of IoT based on development of technology is shown in **Figure 1**. This paper is mainly summarized and contributed as follows. First, we introduce and discuss the concept. There is an overview and trend of the related works in the second section. In the third section, we provided requirement and consideration of security issues for IoT System. In the fourth section, open security issues of smart home network are analyzed. Lastly, we concluded in section five.
