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.


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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