Study of mathematical structures that are fundamentally discrete rather than continuous.
Cryptography uses discrete math (especially number theory and modular arithmetic) to protect information. It involves creating codes and ciphers to keep messages secure.
Every time you send a secure message, use online banking, or shop on the internet, cryptography is working behind the scenes!
Using passwords and encryption to protect your email from hackers.
Online shopping websites use cryptography to secure your credit card data.