Knew this one but fumbled the ordering of the steps under pressure.
Start with a high-level overview of the SSL/TLS handshake's purpose: to establish a secure, authenticated channel. Then, walk through the key steps in order, focusing on the exchange of messages and the cryptographic operations. Finally, highlight important details like certificate verification and key derivation, and mention variations like TLS 1.3.
Pro tip: Emphasize the trade-offs between security and performance, such as the cost of asymmetric cryptography and how session resumption or TLS 1.3's 0-RTT mode mitigate it. This shows you understand real-world system design considerations.
The client initiates the handshake by sending a 'ClientHello' message with supported TLS versions, cipher suites, and a random nonce.
The server responds with a 'ServerHello' selecting the TLS version and cipher suite, and sends its digital certificate for authentication.
The client verifies the certificate, then both parties exchange key material (e.g., using Diffie-Hellman) to derive a shared secret.
Both sides send a 'Finished' message encrypted with the derived keys, confirming the handshake's integrity, after which application data can flow securely.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.