TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)

[Veratyr]

More info:

1. ESNI is already implemented in Firefox
2. Suggestion for ESNI implementation in Chromium
3. Tracking ticket for the work to implement ESNI in BoringSSL
4. IETF ESNI draft (work in progress)

[dimitris-t]

Cloudflare supports it: https://blog.cloudflare.com/encrypted-sni/
Cloudflare ESNI checker: https://www.cloudflare.com/ssl/encrypted-sni/

[FozzieHi]

Just a quick note: This draft has been renamed to Encrypted Client Hello (ECH) and Firefox doesn't currently support ECH with HTTP/3: https://bugzilla.mozilla.org/show_bug.cgi?id=1654507

[imsys]

Browser	Status	Since	Source
Chrome	Behind Flag	v105	https://defo.ie/
Edge	Behind Flag	v105	https://www.neowin.net/guides/how-to-improve-privacy-in-microsoft-edge-by-enabling-encrypted-client-hello/
Safari	NO		https://chromestatus.com/feature/6196703843581952
Firefox	Behind Flag	v85	https://defo.ie/
Opera	No info, probably not
IE	NO
Chrome for Android	Behind Flag	v105
Safari on iOS	NO
Sansung Internet	No info, probably not
Opera Mini	NO
Opera Mobile	No info, probably not
UC Browser for Android	No info, probably not
Android Browser	No info, probably not
Firefox for Android	Firefox beta behind flag	v85
QQ Browser	probably not
Baidu Browser	probably not
KaiOS Browser	probably not

[WebMacke]

Firefox Extension IndicateTLS can show since 7th April and Version 0.3.1 if the current tls connection is using ECH

This is another test page to show if your Browser supports with the current config ECH.

[wallacewill1]

```php
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[rorymalone]

TLS Encrypted Client Hello has now been approved for publication at the IETF as RFC 9849
https://datatracker.ietf.org/doc/rfc9849/

Client support for ECH includes:
Firefox, since v118 https://support.mozilla.org/en-US/kb/understand-encrypted-client-hello
Chrome, since v117 https://chromestatus.com/feature/6196703843581952
Edge, since v117
Opera, since v117

as well as other Chromium-based browsers since v117, plus their mobile variants on Android.

Safari, and all browsers on iOS do not yet support ECH.