This paper discusses security issues in the field of Internet of Things (IoT). It highlights the vulnerabilities of IoT devices and the importance of basic security principles when using them. The paper also presents a case study of the Mirai Botnet attack, which targeted IoT devices and caused a widespread Distributed Denial of Service (DDOS) attack. The paper concludes by emphasizing the need for IoT manufacturers to provide secure devices and for users to learn basic security principles when using IoT devices.