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Review 6: a node remembers the challenges used until they expire, 10 000
at most, and refused every login by key once full. One user holding a
key could make 10 000 logins within five minutes and keep everyone else
out.
A user may now log in by key at most --key-logins-per-user times (100)
on a node within a challenge's lifetime, past which that user waits and
others don't; the 10 000 stay as the cap for all users together. The
lifetime, five minutes until now, is --challenge-lifetime.
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