TLS Handshake Step-by-Step

Step through the TLS 1.2 and 1.3 handshake message by message. See ClientHello, ServerHello, and more.

Interactive Demo

Step 0 of 8

Ready to connect

Client

Handshaking...

Server

ClientHello

Cipher suites, Random nonce

ServerHello

Selected cipher, Random nonce

Certificate

Server public key + Identity

ServerHelloDone

End of server handshake

ClientKeyExchange

Pre-master secret encrypted

ChangeCipherSpec

Switch to encryption

Finished

Encrypted verification

Finished

Ready for secure data!

Dive deeper into the TLS handshake, key exchange algorithms, and TLS 1.2 vs 1.3 differences.