> > But it should be done so that even when a relay node gets operated > by the enemy, the user data should still be secure/protected.
Thank you Mutlu. That is how relay is designed: traffic is p2p encrypted between endpoints, and these opaque blobs are transmitted to/from relay inside a separate session using different nacl keys (see 3.3.2 in the spec for details). Adversary taking over relay can get the meta (which is fairly easy to obscure with fake messages to non-existent HPKs) but not communication contents between endpoints.
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