<s>
In	O
cryptography	O
,	O
ARIA	B-Algorithm
is	O
a	O
block	O
cipher	O
designed	O
in	O
2003	O
by	O
a	O
large	O
group	O
of	O
South	O
Korean	O
researchers	O
.	O
</s>
<s>
The	O
algorithm	O
uses	O
a	O
substitution	B-Algorithm
–	I-Algorithm
permutation	I-Algorithm
network	I-Algorithm
structure	O
based	O
on	O
AES	B-Algorithm
.	O
</s>
<s>
The	O
interface	O
is	O
the	O
same	O
as	O
AES	B-Algorithm
:	O
128-bit	O
block	O
size	O
with	O
key	O
size	O
of	O
128	O
,	O
192	O
,	O
or	O
256	O
bits	O
.	O
</s>
<s>
ARIA	B-Algorithm
uses	O
two	O
8×	O
8-bit	O
S-boxes	B-Algorithm
and	O
their	O
inverses	O
in	O
alternate	O
rounds	O
;	O
one	O
of	O
these	O
is	O
the	O
Rijndael	B-Algorithm
S-box	B-Algorithm
.	O
</s>
<s>
The	O
key	B-Algorithm
schedule	I-Algorithm
processes	O
the	O
key	O
using	O
a	O
3-round	O
256-bit	O
Feistel	B-Algorithm
cipher	I-Algorithm
,	O
with	O
the	O
binary	O
expansion	O
of	O
1/	O
as	O
a	O
source	O
of	O
"	O
nothing	O
up	O
my	O
sleeve	O
numbers	O
"	O
.	O
</s>
<s>
The	O
reference	O
source	O
code	O
of	O
ARIA	B-Algorithm
cipher	O
implemented	O
in	O
C	O
,	O
C++	O
,	O
and	O
Java	O
can	O
be	O
downloaded	O
from	O
KISA	O
's	O
cryptography	O
use	O
activation	O
webpage	O
.	O
</s>
