Flowcharts & Processes

TLS 1.3 1-RTT Handshake Architecture

Flowcharts & Algorithms diagram · made in Skemio

Flowchart showing TLS 1.3 handshake: ClientHello with key share, certificate validation, key derivation, and secure data channel.
Flowchart showing TLS 1.3 handshake: ClientHello with key share, certificate validation, key derivation, and secure data channel.
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What it shows

  • Completes secure negotiation in a single round trip (1-RTT).
  • Key shares ship inside the ClientHello using Diffie-Hellman parameters.
  • Eliminates vulnerable cipher suites like RSA key exchange and CBC ciphers.

The takeaway

TLS 1.3 combines key negotiation with parameter advertisement to secure traffic in one round trip.

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