<s>
The	O
Server-based	O
Certificate	O
Validation	B-Application
Protocol	O
(	O
SCVP	B-Protocol
)	O
is	O
an	O
Internet	B-Protocol
protocol	I-Protocol
for	O
determining	O
the	O
path	O
between	O
an	O
X.509	O
digital	O
certificate	O
and	O
a	O
trusted	O
root	O
(	O
Delegated	B-Protocol
Path	I-Protocol
Discovery	I-Protocol
)	O
and	O
the	O
validation	B-Application
of	O
that	O
path	O
(	O
Delegated	B-Protocol
Path	I-Protocol
Validation	I-Protocol
)	O
according	O
to	O
a	O
particular	O
validation	B-Application
policy	O
.	O
</s>
<s>
SCVP	B-Protocol
provides	O
us	O
with	O
a	O
standards-based	O
client-server	O
protocol	O
for	O
solving	O
this	O
problem	O
using	O
Delegated	B-Protocol
Path	I-Protocol
Discovery	I-Protocol
,	O
or	O
DPD	O
.	O
</s>
<s>
The	O
SCVP	B-Protocol
client	O
's	O
request	O
contains	O
the	O
certificate	O
that	O
it	O
is	O
attempting	O
to	O
trust	O
and	O
a	O
set	O
of	O
trusted	O
certificates	O
.	O
</s>
<s>
The	O
SCVP	B-Protocol
server	O
's	O
response	O
contains	O
a	O
set	O
of	O
certificates	O
making	O
up	O
a	O
valid	O
path	O
between	O
the	O
certificate	O
in	O
question	O
and	O
one	O
of	O
the	O
trusted	O
certificates	O
.	O
</s>
<s>
The	O
response	O
may	O
also	O
contain	O
proof	O
of	O
revocation	O
status	O
,	O
such	O
as	O
OCSP	B-Protocol
responses	O
,	O
for	O
the	O
certificates	O
in	O
the	O
path	O
.	O
</s>
<s>
Again	O
,	O
this	O
could	O
be	O
done	O
locally	O
by	O
the	O
client	O
or	O
by	O
the	O
SCVP	B-Protocol
server	O
with	O
Delegated	B-Protocol
Path	I-Protocol
Validation	I-Protocol
.	O
</s>
<s>
SCVP	B-Protocol
facilitates	O
Federated	O
PKIs	O
,	O
such	O
as	O
one	O
with	O
a	O
Bridge	O
Certificate	O
Authority	O
.	O
</s>
