<s>
In	O
cryptography	O
,	O
Grand	B-Algorithm
Cru	I-Algorithm
is	O
a	O
block	O
cipher	O
invented	O
in	O
2000	O
by	O
Johan	O
Borst	O
.	O
</s>
<s>
Grand	B-Algorithm
Cru	I-Algorithm
is	O
a	O
10-round	O
substitution	B-Algorithm
–	I-Algorithm
permutation	I-Algorithm
network	I-Algorithm
based	O
largely	O
on	O
Rijndael	B-Algorithm
(	O
or	O
AES	B-Algorithm
)	O
.	O
</s>
<s>
It	O
replaces	O
a	O
number	O
of	O
Rijndael	B-Algorithm
's	I-Algorithm
unkeyed	O
operations	O
with	O
key-dependent	O
ones	O
,	O
in	O
a	O
way	O
consistent	O
with	O
the	O
security	O
purposes	O
of	O
each	O
operation	O
.	O
</s>
<s>
The	O
intent	O
is	O
to	O
produce	O
a	O
cipher	O
at	O
least	O
as	O
secure	O
as	O
Rijndael	B-Algorithm
,	O
and	O
perhaps	O
much	O
more	O
secure	O
.	O
</s>
<s>
The	O
block	O
size	O
and	O
key	O
size	O
are	O
both	O
128	O
bits	O
,	O
and	O
the	O
key	B-Algorithm
schedule	I-Algorithm
is	O
the	O
same	O
as	O
Rijndael	B-Algorithm
's	I-Algorithm
.	O
</s>
<s>
Grand	B-Algorithm
Cru	I-Algorithm
is	O
designed	O
on	O
the	O
principle	O
of	O
multiple	O
layered	O
security	O
.	O
</s>
