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TLS 1.3: The Modern Handshake

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TLS 1.3: designed for the modern web

TLS 1.2 requires 2 round trips before any application data flows — catastrophic on 100ms latency networks. TLS 1.3 redesigns the handshake to require only 1 round trip by sending the client's DH key share immediately in the first message, without waiting to agree on parameters first.

TLS 1.3 also removes two decades of legacy cruft: no CBC ciphers, no RSA key exchange, no weak curves — only AEAD ciphers and ephemeral DH.

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