<s>
Mobile	B-Device
secure	I-Device
gateway	I-Device
(	O
MSG	O
)	O
is	O
an	O
industry	O
term	O
for	O
the	O
software	O
or	O
hardware	O
appliance	O
that	O
provides	O
secure	O
communication	O
between	O
a	O
mobile	B-Application
application	I-Application
and	O
respective	O
backend	O
resources	O
typically	O
within	O
a	O
corporate	O
network	O
.	O
</s>
<s>
MSG	O
is	O
typically	O
composed	O
of	O
two	O
components	O
-	O
Client	O
library	B-Library
and	O
Gateway	O
.	O
</s>
<s>
The	O
client	O
is	O
a	O
library	B-Library
that	O
is	O
linked	O
with	O
the	O
mobile	B-Application
application	I-Application
.	O
</s>
<s>
It	O
establishes	O
secure	O
connectivity	O
to	O
Gateway	O
using	O
cryptographic	O
protocol	O
typically	O
SSL/TLS	B-Protocol
.	O
</s>
<s>
This	O
represents	O
a	O
secured	O
channel	O
used	O
for	O
communication	O
between	O
the	O
mobile	B-Application
application	I-Application
and	O
hosts	O
.	O
</s>
<s>
The	O
Client	O
library	B-Library
is	O
linked	O
with	O
the	O
corresponding	O
mobile	B-Application
application	I-Application
,	O
and	O
that	O
provides	O
secure	O
access	O
via	O
the	O
Gateway	O
to	O
the	O
set	O
of	O
Hosts	O
.	O
</s>
<s>
The	O
Client	O
library	B-Library
exposes	O
public	O
API	B-Application
to	O
the	O
mobile	B-Application
application	I-Application
,	O
mimicking	O
platform	O
default	O
HTTP	B-Protocol
client	O
library	B-Library
.	O
</s>
<s>
The	O
application	O
uses	O
this	O
API	B-Application
to	O
communicate	O
with	O
the	O
desired	O
hosts	O
in	O
a	O
secure	O
way	O
.	O
</s>
<s>
Gateway	O
is	O
a	O
server	O
or	O
daemon	B-Operating_System
typically	O
installed	O
onto	O
physical	O
or	O
virtual	O
appliance	O
placed	O
into	O
DMZ	B-General_Concept
.	O
</s>
<s>
The	O
Gateway	O
's	O
public	O
interface	O
is	O
exposed	O
to	O
the	O
Internet	O
(	O
or	O
other	O
untrusted	O
network	O
)	O
and	O
accepts	O
TCP/IP	B-Protocol
connections	O
from	O
mobile	B-Application
applications	I-Application
.	O
</s>
<s>
It	O
operates	O
on	O
IPv4	B-Protocol
and/or	O
IPv6	B-Protocol
networks	O
.	O
</s>
<s>
Incoming	O
client	O
connections	O
typically	O
use	O
SSL/TLS	B-Protocol
to	O
provide	O
security	O
for	O
the	O
network	O
communication	O
and	O
a	O
mutual	O
trust	O
of	O
communicating	O
peers	O
.	O
</s>
<s>
Communication	O
protocol	O
is	O
typically	O
based	O
on	O
HTTP	B-Protocol
.	I-Protocol
</s>
<s>
These	O
are	O
typically	O
HTTP	B-Protocol
or	O
HTTPS	B-Protocol
servers	B-Application
or	O
services	O
within	O
an	O
internal	B-General_Concept
network	I-General_Concept
.	O
</s>
<s>
The	O
response	O
from	O
a	O
host	O
is	O
sent	O
back	O
to	O
the	O
respective	O
mobile	B-Application
app	I-Application
.	O
</s>
