Crypto in Everyday Life
See how cryptography protects your messages, passwords, and payments today.
Welcome
Cryptography protects nearly every digital interaction you have. In this lesson we map real-world technologies to the crypto primitives underneath them.
HTTPS & TLS
When your browser shows a padlock, TLS is running. It uses certificate validation, ECDH key exchange, AES-GCM encryption, and HMAC authentication together.