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http://expyuzz4wqqyqhjn.onion/docs/tor-manual.html#HiddenServiceAuthorizeClient

The auth-type can either be 'basic' for a general-purpose authorization protocol or 'stealth' for a less scalable protocol that also hides service activity from unauthorized clients.

Where can I find documentation on the HiddenServiceAuthorizeClient directive? "hides service activity" seems a little vague. What service activity and how is it hidden? Pros and cons to basic vs stealth?