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[tor-talk] Revoking a hidden service key
If a hidden service operator becomes aware their hidden service private
key has been compromised, for instance if hidden service descriptors
signed with their private key are published that they did not create
themselves, there should be a way for the hidden service operator to
revoke trust in the key and prevent attackers from hijacking traffic to
their .onion domain. I have read the current directory spec, and the
current and proposed Rendezvous spec, but I cannot find any support for
Is hidden service revocation like that possible in the current design,
or have I overlooked something?
If it is not currently possible, I suggest it could be implemented as a
hidden service descriptor listing zero introductory points, and having a
special timestamp value which should never appear in ordinary usage,
1970-1-1 for instance. Hidden Service Directories upon receiving such a
'revocation' descriptor should immediately discard any other descriptors
for that hidden service and should refuse to accept any further
descriptors for that service. Hidden service directories should retain
such a descriptor indefinitely.
The existence of such a revocation mechanism would strengthen the idea
of "controlling" a hidden service or .onion domain. Up until now all a
hidden service owner could do to prove they control a hidden service was
sign something to show they had the key. If this revocation mechanism
existed, they would also be able to show strong evidence that they are
the only one that possesses that key.
Does this sound like a useful feature? Does my suggested implantation
hold water? Any comments appreciated.
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