<s>
Simple	O
and	O
Protected	O
GSSAPI	O
Negotiation	O
Mechanism	O
(	O
SPNEGO	B-Protocol
)	O
,	O
often	O
pronounced	O
"	O
spenay-go	O
"	O
,	O
is	O
a	O
GSSAPI	O
"	O
pseudo	O
mechanism	O
"	O
used	O
by	O
client-server	O
software	O
to	O
negotiate	O
the	O
choice	O
of	O
security	O
technology	O
.	O
</s>
<s>
SPNEGO	B-Protocol
is	O
used	O
when	O
a	O
client	O
application	O
wants	O
to	O
authenticate	O
to	O
a	O
remote	O
server	O
,	O
but	O
neither	O
end	O
is	O
sure	O
what	O
authentication	O
protocols	O
the	O
other	O
supports	O
.	O
</s>
<s>
SPNEGO	B-Protocol
's	O
most	O
visible	O
use	O
is	O
in	O
Microsoft	O
's	O
"	O
HTTP	O
Negotiate	O
"	O
authentication	O
extension	O
.	O
</s>
<s>
It	O
was	O
first	O
implemented	O
in	O
Internet	B-Application
Explorer	I-Application
5.01	O
and	O
IIS	O
5.0	O
and	O
provided	O
single	O
sign-on	O
capability	O
later	O
marketed	O
as	O
Integrated	O
Windows	O
Authentication	O
.	O
</s>
<s>
The	O
negotiable	O
sub-mechanisms	O
included	O
NTLM	O
and	O
Kerberos	B-Protocol
,	O
both	O
used	O
in	O
Active	B-Protocol
Directory	I-Protocol
.	O
</s>
<s>
The	O
draft	O
standard	O
's	O
name	O
is	O
changed	O
from	O
just	O
"	O
Simple	O
"	O
to	O
"	O
Simple	O
and	O
Protected	O
"	O
(	O
spnego	B-Protocol
)	O
.	O
</s>
<s>
December	O
1998	O
(	O
Final	O
)	O
–	O
DER	O
encoding	O
is	O
chosen	O
to	O
disambiguate	O
how	O
the	O
MIC	B-Algorithm
is	O
calculated	O
.	O
</s>
