INTRODUCTION 

What if your home, your car, and your wearable devices could talk to each other—and make decisions for you?

This is the promise of the Internet of Things: a vast, invisible network of smart devices working together to simplify tasks, enhance safety, and improve efficiency.

Understanding IoT opens the door to a world where machines and data work in harmony with human needs. 

Have you ever wondered how your personal data stays secure when you send a message or make an online payment? 

Cryptography is the powerful science behind this protection, using complex mathematical techniques to keep information safe from unauthorized access. As digital security becomes increasingly important, exploring cryptography opens the door to understanding one of the most critical and intriguing areas of modern technology.