<s>
An	O
authentication	B-Application
server	I-Application
provides	O
a	O
network	B-General_Concept
service	I-General_Concept
that	O
applications	O
use	O
to	O
authenticate	O
the	O
credentials	O
,	O
usually	O
account	O
names	O
and	O
passwords	O
,	O
of	O
their	O
users	O
.	O
</s>
<s>
Authentication	O
is	O
used	O
as	O
the	O
basis	O
for	O
authorization	O
,	O
which	O
is	O
the	O
determination	O
whether	O
a	O
privilege	O
may	O
be	O
granted	O
to	O
a	O
particular	O
user	O
or	O
process	B-Operating_System
,	O
privacy	O
,	O
which	O
keeps	O
information	O
from	O
becoming	O
known	O
to	O
non-participants	O
,	O
and	O
non-repudiation	O
,	O
which	O
is	O
the	O
inability	O
to	O
deny	O
having	O
done	O
something	O
that	O
was	O
authorized	O
to	O
be	O
done	O
based	O
on	O
the	O
authentication	O
.	O
</s>
<s>
Major	O
authentication	O
algorithms	O
include	O
passwords	O
,	O
Kerberos	B-Protocol
,	O
and	O
public	B-Application
key	I-Application
encryption	I-Application
.	O
</s>
