as [[User:formulax]] mentioned in
http://mail.wikipedia.org/pipermail/wikipedia-l/2004-September/017409.html
The guy called [[User:Yaohua2000]] today upload a text file,
in which contains passwords of some users, to threaten us.
we deleted the file immediately.
but the situation seems very dangerous for us now,
one can steal the password of our users.
The flood vandalism in Zh: serveral months ago was took by [[User:Yaohua2000]].
This guy seems to be very clever but very evil also.