How to block DoH without blocking other Cloudflare services: ngrep -K 100 http://cloudflare-dns.com 'dst 1.1.1.1 and tcp port 443' - Because SNI.
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It requires the public key to be used to encrypt the SNI header in the handshake. That can be communicated via dns (draft rfc covers dns record format), but I'm not sure it has to be secure and you can cache for ages. It could also be "pinned" in DOH resolver software.
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So the resolver’s public key would be included in the stamp. That’s funny.
End of conversation
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