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RFC 9849. TLS Encrypted Client Hello

https://www.rfc-editor.org/rfc/rfc9849.html

36•P_qRs•1h ago

Comments

weitzj•51m ago

Will this have an impact on Loadbalancers? Like does one have to do client side load balancing like in gRPC?

j16sdiz•30m ago

The loadbalancer can force a downgrade .

grenran•13m ago

My understanding is that you can use split mode to only have the load balancer decrypt the server name section, and forward the actual session and key exchange down to the backend without doing double layer encryption.

ivanr•41m ago

I wrote about ECH a couple of months ago, when the specs were still in draft but already approved for publication. It's a short read, if you're not already familiar with ECH and its history: https://www.feistyduck.com/newsletter/issue_127_encrypted_cl...

In addition to the main RFC 9849, there is also RFC 9848 - "Bootstrapping TLS Encrypted ClientHello with DNS Service Bindings": https://datatracker.ietf.org/doc/rfc9848/

There's an example of how it's used in the article.

fmajid•5m ago

Thanks for the writeup, Ivan, I am a great fan of your work!

Now we need to get Qualys to cap SSL Labs ratings at B for servers that don't support ECH. Also those that don't have HSTS and HSTS Preload while we're at it.

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