TLS

Client Hello

• What happens in a TLS handshake? | SSL handshake | Cloudflare

ACME Challenge

Automated Certificate Management Environment

• Challenge Types - Let’s Encrypt

Performance

TLS 1.2 (and earlier)

• New Connection: 4 RTT + DNS
• Resumed Connection: 3 RTT + DNS

TLS 1.3

• New Connection: 3 RTT + DNS
• Resumed Connection: 3 RTT + DNS

TLS 1.3 + 0-RTT

• New Connection: 3 RTT + DNS
• Resumed Connection: 2 RTT + DNS
• encrypted HTTPS requests become just as fast as an unencrypted HTTP requests.
• Replay Attack

x509

Links

• TLS Hnadshake