<s>
Outline	B-Application
VPN	I-Application
is	O
a	O
free	B-License
and	I-License
open-source	I-License
tool	O
that	O
deploys	O
Shadowsocks	B-Language
servers	O
on	O
multiple	O
cloud	B-Architecture
service	I-Architecture
providers	I-Architecture
.	O
</s>
<s>
The	O
software	O
suite	O
also	O
includes	O
client	B-Protocol
software	I-Protocol
for	O
multiple	B-Operating_System
platforms	I-Operating_System
.	O
</s>
<s>
Outline	O
was	O
developed	O
by	O
Jigsaw	O
,	O
a	O
technology	O
incubator	O
created	O
by	O
Google	B-Application
.	I-Application
</s>
<s>
The	O
Outline	O
Server	O
supports	O
self-hosting	O
,	O
as	O
well	O
as	O
cloud	B-Architecture
service	I-Architecture
providers	I-Architecture
including	O
DigitalOcean	B-Application
,	O
Rackspace	B-Application
,	O
Google	B-General_Concept
Cloud	I-General_Concept
Platform	I-General_Concept
,	O
and	O
Amazon	B-General_Concept
EC2	I-General_Concept
.	O
</s>
<s>
Installation	O
involves	O
running	O
a	O
command	O
on	O
its	O
command-line	B-Application
interface	I-Application
,	O
or	O
in	O
the	O
case	O
of	O
installing	O
on	O
DigitalOcean	B-Application
or	O
Google	B-Application
Cloud	O
,	O
its	O
graphical	B-Application
user	I-Application
interface	I-Application
.	O
</s>
<s>
The	O
Outline	O
Server	O
acts	O
as	O
a	O
proxy	B-Application
and	O
relays	O
connections	O
between	O
the	O
client	O
and	O
the	O
sites	O
they	O
want	O
to	O
access	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
Shadowsocks	B-Language
,	O
and	O
offers	O
a	O
REST	B-Protocol
API	I-Protocol
for	O
management	O
of	O
the	O
server	O
by	O
the	O
Outline	O
Manager	O
application	O
.	O
</s>
<s>
The	O
Outline	O
Manager	O
is	O
a	O
graphical	B-Application
application	I-Application
used	O
to	O
deploy	B-Application
and	O
manage	O
access	O
to	O
Outline	O
Servers	O
.	O
</s>
<s>
It	O
supports	O
Windows	B-Application
,	O
macOS	B-Application
and	O
Linux	B-Application
.	O
</s>
<s>
It	O
supports	O
Windows	B-Application
,	O
macOS	B-Application
,	O
Linux	B-Application
,	O
ChromeOS	B-Operating_System
,	O
Android	B-Application
,	O
and	O
iOS	B-Application
.	O
</s>
<s>
Outline	O
uses	O
the	O
Shadowsocks	B-Language
protocol	O
for	O
communication	O
between	O
the	O
client	O
and	O
server	O
.	O
</s>
<s>
Traffic	O
is	O
encrypted	O
with	O
the	O
IETF	O
ChaCha20	O
stream	B-Algorithm
cipher	I-Algorithm
(	O
256-bit	O
key	B-Application
)	O
and	O
authenticated	O
with	O
the	O
IETF	O
Poly1305	B-Algorithm
authenticator	O
.	O
</s>
<s>
Outline	O
is	O
free	B-License
and	I-License
open-source	I-License
,	O
licensed	O
under	O
the	O
Apache	B-Application
License	I-Application
2.0	O
,	O
and	O
was	O
audited	O
by	O
Radically	O
Open	O
Security	O
and	O
claims	O
not	O
to	O
log	B-Application
users	O
 '	O
web	O
traffic	O
.	O
</s>
<s>
Outline	O
is	O
not	O
a	O
true	O
VPN	B-Application
solution	O
but	O
rather	O
a	O
Shadowsocks-based	O
proxy	B-Application
.	O
</s>
<s>
The	O
two	O
technologies	O
are	O
similar	O
in	O
the	O
way	O
they	O
can	O
be	O
used	O
to	O
redirect	O
network	O
traffic	O
and	O
make	O
it	O
appear	O
as	O
originating	O
from	O
another	O
device	O
(	O
the	O
server	O
)	O
,	O
and	O
hide	O
the	O
traffic	O
's	O
final	O
destination	O
from	O
observers	O
and	O
filters	O
until	O
it	O
reaches	O
the	O
proxy	B-Application
server	I-Application
.	O
</s>
<s>
However	O
,	O
a	O
VPN	B-Application
has	O
additional	O
capabilities	O
,	O
such	O
as	O
encapsulating	O
traffic	O
within	O
a	O
virtual	O
tunnel	O
,	O
and	O
allowing	O
connected	O
devices	O
to	O
"	O
see	O
"	O
each	O
other	O
(	O
as	O
if	O
they	O
were	O
connected	O
to	O
a	O
LAN	B-General_Concept
)	O
.	O
</s>
<s>
Outline	O
is	O
not	O
an	O
anonymity	O
tool	O
,	O
and	O
it	O
does	O
not	O
provide	O
the	O
same	O
degree	O
of	O
anonymity	O
protections	O
as	O
Tor	B-Operating_System
Browser	I-Operating_System
,	O
which	O
routes	B-Protocol
traffic	I-Protocol
through	O
three	O
hops	B-Protocol
rather	O
than	O
just	O
one	O
and	O
also	O
protects	O
against	O
attacks	O
like	O
browser	B-Protocol
fingerprinting	I-Protocol
.	O
</s>
<s>
In	O
March	O
2018	O
,	O
Max	O
Eddy	O
of	O
PCMag	O
stated	O
that	O
a	O
preview	O
version	O
of	O
Outline	B-Application
VPN	I-Application
was	O
"	O
startlingly	O
easy	O
to	O
use	O
"	O
and	O
"	O
removes	O
privacy	O
concerns	O
associated	O
with	O
VPN	B-Application
companies	O
"	O
.	O
</s>
<s>
However	O
,	O
Eddy	O
criticized	O
the	O
software	O
for	O
not	O
encrypting	O
all	O
traffic	O
on	O
Windows	B-Application
,	O
and	O
warned	O
users	O
that	O
"	O
individual	O
use	O
may	O
lack	O
some	O
anonymity	O
compared	O
 [ to ] 	O
large	O
VPN	B-Application
companies	O
"	O
.	O
</s>
<s>
Since	O
version	O
1.2	O
,	O
the	O
Outline	O
Windows	B-Application
client	O
came	O
out	O
of	O
'	O
Beta	O
 '	O
,	O
effectively	O
beginning	O
to	O
encrypt	O
all	O
traffic	O
from	O
the	O
device	O
,	O
on	O
par	O
with	O
the	O
Outline	O
clients	O
for	O
macOS	B-Application
,	O
ChromeOS	B-Operating_System
,	O
Android	B-Application
,	O
and	O
iOS	B-Application
.	O
</s>
