<s>
However	O
,	O
this	O
decision	O
has	O
historically	O
limited	O
the	O
competition	O
of	O
web	B-Application
browsers	I-Application
in	O
Korea	O
,	O
as	O
no	O
major	O
SSL	O
libraries	O
or	O
web	B-Application
browsers	I-Application
supported	O
the	O
SEED	O
algorithm	O
,	O
requiring	O
users	O
to	O
use	O
an	O
ActiveX	B-Application
control	I-Application
in	O
Internet	B-Application
Explorer	I-Application
for	O
secure	O
web	O
sites	O
.	O
</s>
<s>
On	O
April	O
1	O
,	O
2015	O
the	O
Ministry	O
of	O
Science	O
,	O
ICT	O
and	O
Future	O
Planning	O
(	O
MSIP	O
)	O
announced	O
its	O
plan	O
to	O
remove	O
the	O
ActiveX	B-Application
dependency	O
from	O
at	O
least	O
90	O
percent	O
of	O
the	O
country	O
's	O
top	O
100	O
websites	O
by	O
2017	O
.	O
</s>
<s>
Instead	O
,	O
HTML5-based	O
technologies	O
will	O
be	O
employed	O
as	O
they	O
operate	O
on	O
many	O
platforms	O
,	O
including	O
mobile	O
devices	O
.	O
</s>
<s>
SEED	O
is	O
a	O
16-round	O
Feistel	B-Algorithm
network	I-Algorithm
with	O
128-bit	O
blocks	O
and	O
a	O
128-bit	O
key	O
.	O
</s>
<s>
It	O
uses	O
two	O
8	O
×	O
8	O
S-boxes	B-Algorithm
which	O
,	O
like	O
those	O
of	O
SAFER	B-Algorithm
,	O
are	O
derived	O
from	O
discrete	O
exponentiation	O
(	O
in	O
this	O
case	O
,	O
x247	O
and	O
x251	O
plus	O
some	O
"	O
incompatible	O
operations	O
"	O
)	O
.	O
</s>
<s>
It	O
also	O
has	O
some	O
resemblance	O
to	O
MISTY1	B-Algorithm
in	O
the	O
recursiveness	O
of	O
its	O
structure	O
:	O
the	O
128-bit	O
full	O
cipher	O
is	O
a	O
Feistel	B-Algorithm
network	I-Algorithm
with	O
an	O
F-function	B-Algorithm
operating	O
on	O
64-bit	O
halves	O
,	O
while	O
the	O
F-function	B-Algorithm
itself	O
is	O
a	O
Feistel	B-Algorithm
network	I-Algorithm
composed	O
of	O
a	O
G-function	O
operating	O
on	O
32-bit	O
halves	O
.	O
</s>
<s>
However	O
the	O
recursion	O
does	O
not	O
extend	O
further	O
because	O
the	O
G-function	O
is	O
not	O
a	O
Feistel	B-Algorithm
network	I-Algorithm
.	O
</s>
<s>
In	O
the	O
G-function	O
,	O
the	O
32-bit	O
word	O
is	O
considered	O
as	O
four	O
8-bit	O
bytes	O
,	O
each	O
of	O
which	O
is	O
passed	O
through	O
one	O
or	O
the	O
other	O
of	O
the	O
S-boxes	B-Algorithm
,	O
then	O
combined	O
in	O
a	O
moderately	O
complex	O
set	O
of	O
boolean	O
functions	O
such	O
that	O
each	O
output	O
bit	O
depends	O
on	O
3	O
of	O
the	O
4	O
input	O
bytes	O
.	O
</s>
<s>
SEED	O
has	O
a	O
fairly	O
complex	O
key	B-Algorithm
schedule	I-Algorithm
,	O
generating	O
its	O
thirty-two	O
32-bit	O
subkeys	O
through	O
application	O
of	O
its	O
G-function	O
on	O
a	O
series	O
of	O
rotations	O
of	O
the	O
raw	O
key	O
,	O
combined	O
with	O
round	O
constants	O
derived	O
(	O
as	O
in	O
TEA	B-Algorithm
)	O
from	O
the	O
Golden	O
ratio	O
.	O
</s>
<s>
SEED	O
has	O
been	O
adopted	O
by	O
several	O
standard	O
protocols	O
:	O
S/MIME	B-Protocol
(	O
RFC	O
4010	O
)	O
,	O
TLS/SSL	B-Protocol
(	O
RFC	O
4162	O
)	O
,	O
IPSec	B-Protocol
(	O
RFC	O
4196	O
)	O
,	O
and	O
ISO/IEC	O
18033-3:2010	O
.	O
</s>
<s>
NSS	B-Protocol
software	O
security	O
library	O
in	O
Mozilla	O
's	O
Gecko	O
platform	O
has	O
implemented	O
support	O
for	O
SEED	O
,	O
and	O
Mozilla	B-Application
Firefox	I-Application
as	O
of	O
3.5.4	O
supports	O
SEED	O
as	O
a	O
TLS	O
cipher	O
;	O
however	O
,	O
Mozilla	O
decided	O
to	O
drop	O
the	O
support	O
of	O
SEED	O
by	O
default	O
in	O
Firefox	B-Application
27	O
and	O
above	O
because	O
support	O
for	O
SEED	O
has	O
not	O
had	O
any	O
practical	O
positive	O
effect	O
in	O
terms	O
of	O
helping	O
South	O
Korea	O
migrate	O
away	O
from	O
ActiveX-based	O
e-commerce	O
,	O
and	O
other	O
browsers	B-Application
are	O
not	O
offering	O
any	O
SEED-based	O
cipher	O
suites	O
.	O
</s>
<s>
NSS	B-Protocol
still	O
supports	O
SEED-based	O
cipher	O
suites	O
.	O
</s>
<s>
The	O
Linux	B-Operating_System
kernel	I-Operating_System
has	O
supported	O
SEED	O
since	O
2007	O
.	O
</s>
