<s>
Subject	B-General_Concept
Alternative	I-General_Concept
Name	I-General_Concept
(	O
SAN	O
)	O
is	O
an	O
extension	O
to	O
X.509	O
that	O
allows	O
various	O
values	O
to	O
be	O
associated	O
with	O
a	O
security	O
certificate	O
using	O
a	O
subjectAltName	B-General_Concept
field	O
.	O
</s>
<s>
These	O
values	O
are	O
called	O
Subject	B-General_Concept
Alternative	I-General_Concept
Names	I-General_Concept
(	O
SANs	O
)	O
.	O
</s>
<s>
DNS	B-Protocol
names	I-Protocol
:	O
this	O
is	O
usually	O
also	O
provided	O
as	O
the	O
Common	O
Name	O
RDN	O
within	O
the	O
Subject	O
field	O
of	O
the	O
main	O
certificate	O
.	O
</s>
<s>
Other	O
names	O
,	O
given	O
as	O
a	O
General	O
Name	O
or	O
Universal	B-General_Concept
Principal	I-General_Concept
Name	I-General_Concept
:	O
a	O
registered	O
object	O
identifier	O
followed	O
by	O
a	O
value	O
.	O
</s>
<s>
(	O
May	O
2000	O
)	O
specifies	O
Subject	B-General_Concept
Alternative	I-General_Concept
Names	I-General_Concept
as	O
the	O
preferred	O
method	O
of	O
adding	O
DNS	B-Protocol
names	I-Protocol
to	O
certificates	O
,	O
deprecating	O
the	O
previous	O
method	O
of	O
putting	O
DNS	B-Protocol
names	I-Protocol
in	O
the	O
commonName	O
field	O
.	O
</s>
<s>
Google	B-Application
Chrome	I-Application
version	O
58	O
(	O
March	O
2017	O
)	O
removed	O
support	O
for	O
checking	O
the	O
commonName	O
field	O
at	O
all	O
,	O
instead	O
only	O
looking	O
at	O
the	O
SANs	O
.	O
</s>
