Our scenario

Meet Alice.

Hi!

Alice has a secret: it took her ages to understand RSA encryption.

Actually, it was a couple days - but she doesn't want anybody to know the exact number of days, except for her friend Bob.

Yo.

Alice's nosy classmate, Maddie, really enjoys listening to Alice and Bob talking.

Alice knows this and decides to use RSA encryption to communicate this number to Bob.

Ugh..

This way, even if Maddie is listening, she will never be able to understand what they are saying!