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Bug 12498 needs a changes file.
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o Major features (Ed25519 identity keys: #12498, Prop220):
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- All relays now maintain a stronger identity key, using the
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Ed25519 elliptic curve signature format. This master key is
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designed so that it can be kept offline. Relays also generate
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an online signing key, and a set of other Ed25519 keys and certificates.
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These are all automatically regenerated and rotated as needed.
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- Directory authorities track which Ed25519 identity keys have been
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used with which RSA1024 identity keys, and do not allow them to vary
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freely.
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- Directory authorities now vote on Ed25519 identity keys along with
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RSA1024 keys.
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- Microdescriptors now include ed25519 identity keys.
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o Major features (onion key cross-certification):
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- Relay descriptors now include signatures of the identity keys using
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the TAP and ntor onion keys. This allows relays to prove ownership of
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their own onion keys. Because of this change, microdescriptors no longer
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need to include RSA identity keys. Implements proposal 228;
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closes ticket 12499.
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o Code simplification and refactoring:
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- The link authentication code has been refactored for better testability
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and reliability. It now uses code generated with the "trunnel"
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binary encoding generator, to reduce the risk of bugs due to
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programmer error. Done as part of ticket 12498.
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o Testing:
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- The link authentication protocol code now has extensive tests.
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- The relay descriptor signature testing code now has extensive tests.
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