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Closed
Created by cypherpunks@cypherpunks

document max. value of SigningKeyLifetime

tor's manpage says:

SigningKeyLifetime N days|weeks|months For how long should each Ed25519 signing key be valid? Tor uses a permanent master identity key that can be kept offline, and periodically generates new "signing" keys that it uses online. This option configures their lifetime. (Default: 30 days)

It does not include information about what is the biggest acceptable value. Tor simply fails to start if the given value is to big:

[warn] Interval 'XX months' is too long
[warn] Failed to parse/validate config: Interval 'SigningKeyLifetime XX months' is malformed or out of bounds.

Please also mention if there is a value for SigningKeyLifetime where it is actually less safe than running in non-OfflineMasterKey mode (maybe it is less safe to set it to 10y in OfflineMasterKey mode than to run in non-OfflineMasterKey mode?) and if it makes any sense to modify this value in non-OfflineMasterKey mode (because that is apparently possible).

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