Why Prime Numbers Are the Secret to Cryptography?

Prime numbers are like secret passwords that help keep our messages safe online.

Imagine you and your friend want to send a message without anyone else reading it. You both agree on a special number, let's say 10. If someone sees the message, they might guess it was made using 10, but if you use prime numbers, like 3 and 7, which multiply together to make 21, then even if someone sees 21, they can’t easily figure out what 3 and 7 were.

Think of a prime number as something that’s hard to break apart. Like a chocolate bar that only has one row, you can't split it into smaller pieces without breaking it. A regular number, like 12, is easier to split because it has many factors (like 2, 3, 4, and 6).

In real life, people use very big prime numbers in computers to make secret codes that are almost impossible for others to crack, just like how your favorite lock is hard to open without the right key.