
This room focuses on 4 different kinds of firewalls in terms of internet security.

The handshake behind every HTTPS connection — what each side sends, how a shared key appears without ever crossing the wire, and what the padlock does and does not promise.

How a card number is protected in storage, at the terminal, and at checkout -- PCI DSS, tokenization, EMV chips, and 3-D Secure, tied back to the encryption and certificates covered earlier in this path.

The threats that work even when every cryptographic protocol is implemented correctly: malware types, social engineering, supply-chain attacks, and the defenses -- IDS/IPS, honeypots, backups -- built to catch each one.

Learn how trust is built on the internet. Explore how public–private key pairs, digital certificates, and Certificate Authorities work together to authenticate identities, secure communication, and prevent tampering.