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The TLS Encrypted ClientHello (ECH) extension enables clients to encrypt ClientHello messages, which are normally sent in cleartext, under a server’s public key. This avoids leaking sensitive fields like the server name to the network. ECH is currently specified in draft-ietf-tls-esni-08. Note that earlier iterations of this specification were called Encrypted Server Name Indication, or ESNI.

Specification

Editor's draft

Status in Chromium

Internals>Network>SSL


No active development (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

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Owners

Intent to Prototype url

Intent to Prototype thread

Search tags

ech, esni,

Last updated on 2021-04-04