<s>
In	O
cryptography	O
,	O
Mutual	O
Irregular	O
Clocking	O
KEYstream	B-Algorithm
generator	O
(	O
MICKEY	B-Algorithm
)	O
is	O
a	O
stream	B-Algorithm
cipher	I-Algorithm
algorithm	O
developed	O
by	O
Steve	O
Babbage	O
and	O
Matthew	O
Dodd	O
.	O
</s>
<s>
The	O
cipher	O
maps	O
an	O
80-bit	O
key	O
and	O
a	O
variable	O
length	O
initialization	B-Algorithm
vector	I-Algorithm
(	O
0	O
to	O
80	O
bits	O
)	O
to	O
a	O
keystream	B-Algorithm
with	O
a	O
maximum	O
length	O
of	O
240	O
bits	O
.	O
</s>
<s>
The	O
keystream	B-Algorithm
generator	O
makes	O
use	O
of	O
two	O
registers	O
R	O
and	O
S	O
(	O
100	O
bits	O
each	O
)	O
.	O
</s>
<s>
The	O
keystream	B-Algorithm
production	O
stage	O
in	O
MICKEY	B-Algorithm
2.0	O
is	O
preceded	O
by	O
the	O
three	O
stages	O
:	O
-	O
IV	O
Loading	O
,	O
Key	O
Loading	O
and	O
Preclock	O
.	O
</s>
<s>
Unlike	O
Trivium	O
,	O
MICKEY	B-Algorithm
2.0	O
does	O
not	O
allow	O
direct	O
loading	O
of	O
Key	O
and	O
IV	O
bits	O
on	O
to	O
the	O
state	O
register	O
.	O
</s>
<s>
MICKEY	B-Algorithm
2.0	O
can	O
be	O
protected	O
by	O
an	O
XOR-CHAIN	O
structure	O
.	O
</s>
<s>
As	O
of	O
2013	O
,	O
a	O
differential	O
fault	O
attack	O
has	O
been	O
reported	O
against	O
MICKEY	B-Algorithm
2.0	O
by	O
Subhadeep	O
Banik	O
and	O
Subhamoy	O
Maitra	O
.	O
</s>
