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I'm running a TOR relay and I'm confused with the node identity keys. The secret_id_key is the identity key that was used in version 2, but now the ed25519_master_id_key is used for version 3?

Thanks.

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secret_id_key is an RSA key and ed25519_master_id_key is a Ed25519 key used for Hidden Services v3.

Here is what the spec says about it: https://gitweb.torproject.org/torspec.git/tree/rend-spec-v3.txt#n127

0.1. Improvements over previous versions.

Here is a list of improvements of this proposal over the legacy hidden services:

  • Better crypto (replaced SHA1/DH/RSA1024 with SHA3/ed25519/curve25519)
  • Improved directory protocol leaking less to directory servers.
  • Improved directory protocol with smaller surface for targeted attacks.
  • Better onion address security against impersonation.
  • More extensible introduction/rendezvous protocol.
  • Offline keys for onion services
  • Advanced client authorization

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