ECH (Encrypted ClientHello) 108EdgeECH (Encrypted ClientHello)cloudflareDOH Welco 20

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Understanding the Context

ECH also changes the key distribution and encryption stories: A TLS server supporting ECH now advertises its public key via an HTTPSSVC DNS record, whereas ESNI used TXT records for this.

ESNI and ECH: A long overdue overhaul ESNI ECH TLS 1.3 sends the server certificate later on in the conversation, no longer exposing the endpoint a user is visiting in the plaintext portion of.

ECH had been proposed by the very same researchers behind the ESNI draft as a natural evolution of the ESNI standard. ECH TLS 1.3 Handshake Client.

ECH? ECHCloudflareECH .

Key Insights

echech25nginx IPIP.

Ech Ech H2 CO2A .

  1. BPA ECH BPA ECH 1:2 ECH 1:2.2~2.5 ECH BPA .