<s>
Accounts	B-Language
&	I-Language
SSO	I-Language
,	O
accounts-sso	B-Language
,	O
or	O
lately	O
gSSO	O
is	O
a	O
single	O
sign-on	O
framework	O
for	O
computers	O
.	O
</s>
<s>
Originating	O
as	O
part	O
of	O
Maemo	O
5	O
Accounts-SSO	B-Language
is	O
free	B-Application
software	I-Application
licensed	O
under	O
LGPL	B-Application
2.1	I-Application
.	O
</s>
<s>
Accounts-SSO	B-Language
was	O
deployed	O
as	O
a	O
standard	O
component	O
of	O
Nokia	B-Application
N900	I-Application
,	O
Nokia	B-Operating_System
N9	I-Operating_System
,	O
Tizen	B-Application
,	O
and	O
Ubuntu	B-Operating_System
.	O
</s>
<s>
Later	O
it	O
was	O
integrated	O
in	O
KDE	B-Language
Plasma	I-Language
Workspaces	I-Language
.	O
</s>
<s>
Accounts-SSO	B-Language
was	O
originally	O
developed	O
by	O
Nokia	O
who	O
eventually	O
shipped	O
it	O
as	O
part	O
of	O
Maemo	O
5	O
on	O
.	O
</s>
<s>
After	O
the	O
MeeGo	O
project	O
ended	O
,	O
Accounts-SSO	B-Language
was	O
transferred	O
into	O
an	O
independent	O
project	O
by	O
Intel	O
.	O
</s>
<s>
Canonical	O
Ltd	O
then	O
adopted	O
Accounts-SSO	B-Language
for	O
Ubuntu	B-Operating_System
12.10	O
(	O
later	O
also	O
Ubuntu	B-Protocol
Touch	I-Protocol
)	O
and	O
KDE	B-Application
integrated	O
it	O
in	O
November	O
2012	O
.	O
</s>
<s>
Among	O
Accounts-SSO	B-Language
'	O
s	O
features	O
are	O
a	O
plugin-based	O
architecture	O
,	O
working	O
with	O
diverse	O
user	O
interfaces	O
,	O
storage	O
back-ends	O
,	O
and	O
varying	O
levels	O
of	O
security	O
.	O
</s>
<s>
While	O
Accounts-SSO	B-Language
is	O
primarily	O
being	O
used	O
for	O
centralized	O
login	O
management	O
to	O
social	O
networking	O
services	O
,	O
e.g.	O
</s>
<s>
sharing	B-Algorithm
photos	I-Algorithm
to	O
a	O
service	O
from	O
an	O
image	O
managing	O
application	O
and	O
chatting	B-Protocol
on	O
the	O
same	O
service	O
from	O
an	O
instant	B-Application
messenger	I-Application
,	O
its	O
plugin-based	O
architecture	O
also	O
allows	O
for	O
local	O
usage	O
,	O
such	O
as	O
disk	O
encryption	O
for	O
which	O
a	O
cryptsetup	O
plugin	O
for	O
Accounts-SSO	B-Language
was	O
developed	O
.	O
</s>
<s>
The	O
Accounts-SSO	B-Language
framework	O
consists	O
of	O
several	O
individually	O
released	O
components	O
:	O
</s>
<s>
signond	O
:	O
A	O
daemon	B-Operating_System
providing	O
the	O
SSO	O
service	O
over	O
D-Bus	O
–	O
originally	O
Qt-based	O
,	O
it	O
's	O
being	O
rewritten	O
by	O
Intel	O
using	O
only	O
GLib	B-Language
.	O
</s>
<s>
libaccounts-glib	O
:	O
GLib-based	O
client	O
library	O
for	O
managing	O
the	O
accounts	O
database	O
.	O
</s>
<s>
libaccounts-qt	O
:	O
Client	O
library	O
for	O
managing	O
the	O
accounts	O
database	O
for	O
Qt-based	O
applications	O
–	O
implemented	O
as	O
wrapper	O
around	O
libaccounts-glib	O
.	O
</s>
<s>
libsignon-glib	O
:	O
GLib-based	O
client	O
library	O
for	O
applications	O
handling	O
account	O
authentication	O
through	O
the	O
signond	O
Single	O
Sign-On	O
service	O
.	O
</s>
<s>
signon	O
plugins	O
:	O
A	O
handful	O
of	O
signond	O
authentication	O
plugins	O
are	O
developed	O
within	O
the	O
Accounts-SSO	B-Language
project	O
.	O
</s>
<s>
Among	O
them	O
plugins	O
for	O
Digest	B-Protocol
access	I-Protocol
,	O
OAuth	O
,	O
SASL	O
,	O
and	O
X.509	O
.	O
</s>
<s>
account	O
plugins	O
:	O
The	O
Accounts-SSO	B-Language
project	O
leaves	O
development	O
of	O
plugins	O
for	O
specific	O
services	O
to	O
3rd	O
parties	O
.	O
</s>
<s>
Open	O
source	O
plugins	O
for	O
various	O
services	O
(	O
Facebook	B-Application
,	O
Google	B-Application
,	O
Twitter	B-Application
,...	O
)	O
are	O
being	O
developed	O
by	O
Canonical	O
.	O
</s>
