Linux basic authentication?

["" <redcowboy () nate com>]

Hi, All.
I'm studying linux security.
I have two question.
First of all, I heard Kerberos is window basic 
authentication protocol.
then, what's linux(or Unix) basic authentication 
protocol?
if is it there, could you explain how does it work or 
something..
Seconds, How could I understand Linux security 
concepts?
I'd ask some advices or recommends.
Thanks a lot. Have a great day!
 
Greg

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