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Is it possible to rekey a connection between a Tor client and a relay? By rekey I mean perform the usual x25519 key exchange to change the session key on the fly, without tearing the circuit down.

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Not possible yet. Proposal 262 is still open and there is no other rekey mechanism.

  • Thank you. This is exactly what I was looking for. This proposal seems to be specifically for AEZ, and I recall the decision was to consider ChaCha20-Poly1305 instead, so the prop may not get much traction. – forest Sep 15 '18 at 6:55

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