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This is precisely the conclusion Google reached and has used as they work on QUIC.

Even protocol state (equivalents of TCP FIN/SYN/etc) is encrypted, to ensure that middleboxes don't get ideas about what the protocol is 'supposed' to do - ideas which make it hard to change the protocol in the future.




It is really sad that one reason why QUIC encrypts protocol states is to prevent excessively eager middleboxes from meddling with the traffic.




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