<s>
The	O
Authentication	O
Open	B-Architecture
Service	I-Architecture
Interface	I-Architecture
Definition	I-Architecture
(	O
OSID	B-Architecture
)	O
is	O
an	O
O.K.I.	O
</s>
<s>
specification	B-Application
which	O
supports	O
invoking	O
an	O
authentication	O
process	O
.	O
</s>
<s>
OSIDs	B-Architecture
are	O
programmatic	O
interfaces	O
which	O
comprise	O
a	O
Service	O
Oriented	O
Architecture	O
for	O
designing	O
and	O
building	O
reusable	B-Application
and	O
interoperable	O
software	O
.	O
</s>
<s>
This	O
service	O
also	O
supports	O
testing	O
if	O
a	O
user	O
is	O
authenticated	O
,	O
returning	O
the	O
Agent	B-Architecture
identity	O
that	O
corresponds	O
to	O
the	O
authenticated	O
user	O
.	O
</s>
<s>
The	O
OSIDs	B-Architecture
can	O
interact	O
with	O
information	O
and	O
resources	O
over	O
which	O
some	O
form	O
of	O
access	O
control	O
is	O
required	O
.	O
</s>
<s>
Authentication	O
,	O
Agent	B-Architecture
,	O
and	O
Authorization	B-Architecture
work	O
together	O
where	O
Authentication	O
ensures	O
interactions	O
are	O
at	O
the	O
request	O
of	O
an	O
identified	O
user	O
and	O
Authorization	B-Architecture
reports	O
what	O
the	O
identified	O
user	O
can	O
do	O
.	O
</s>
