The emergence of the Internet of Things (IoT) has ushered in an unprecedented level of connectivity, revolutionizing both everyday life and business operations through the exchange of data among various devices. Nonetheless, the extensive adoption of IoT presents notable security challenges that necessitate effective solutions. This research article delves into the secure Internet of Things, concentrating on two key concepts: digital signatures and message authentication codes (MACs). Ensuring data accuracy and correctness is vital in the dynamic IoT landscape, characterized by diverse financial resources from different devices. The Message Authentication Code (MAC) is a pivotal encryption technique for message authentication, achieved by appending a cryptographic tag. Additionally, we explore digital signatures, another crypto-graphic foundation, to bolster IoT security. Digital signatures provide protection against sender repudiation, along with verification and denial, and serve as evidence of message history. This reliability is essential in applications where input data accuracy is critical for decision-making. We propose strategies for implementing these security measures within an IoT ecosystem, considering the limitations posed by resource-constrained devices. Lightweight encryption techniques and innovative hardware accelerators enable the integration of MACs and digital signatures, even with the limited capabilities of IoT devices. We evaluated the performance and security of MACs and digital signatures through extensive tests and simulations, highlighting their strengths and weaknesses. As the IoT ecosystem continues to grow, maintaining data in-tegrity and communication authenticity remains crucial, underscoring the significance of MACs and digital signatures in enhancing IoT system security.

IoT, Secure Communication, Message Authentication Code (MAC), Digital Signature