The Internet of Things (IoT) connects a vast array of devices ranging from everyday household appliances to industrial machinery. This convenient technology allows for seamless data communication and enables automation of various aspects of daily life. However, this interconnectedness also introduces many security challenges that can lead to data breaches or malicious access to personal data. As many IoT devices are often resource constrained and deployed in nonsecured environments, it makes these devices susceptible to various cyber threats. Traditional cryptographic algorithms like AES (Advanced Encryption Standard) are widely recognized for their effectiveness and reliability, but they are not always feasible for low-power, resource-limited IoT devices due to their computational complexity. The objective of this report is to critically evaluate the security aspects and mechanism in IoT devices and explore the use of lightweight AES cryptography to address the security challenges in IoT in order to help reduce the cyber risk of devices.