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Yep, this key thing is good if your a newbie and wanna get root access to a box. Trust me...no real Ha0ker will ever use the normal port 22 to get in.
The real deal is a tcp wrapper who only allows your own ip in or only allows physical onsite access to the server. Close all fucking useless ports. Thats way more secure than any other rotating beeper crap....
my 2 cents
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