<s>
SAVILLE	B-Algorithm
is	O
a	O
classified	O
NSA	O
Type	O
1	O
encryption	O
algorithm	O
,	O
developed	O
in	O
the	O
late	O
1960s	O
,	O
jointly	O
by	O
the	O
Government	O
Communications	O
Headquarters	O
(	O
GCHQ	O
)	O
in	O
the	O
UK	O
and	O
the	O
National	O
Security	O
Agency	O
(	O
NSA	O
)	O
in	O
the	O
US	O
.	O
</s>
<s>
Some	O
documentation	O
related	O
to	O
the	O
KYK-13	O
fill	O
device	O
and	O
statements	O
made	O
by	O
military	O
officials	O
confirm	O
that	O
SAVILLE	B-Algorithm
has	O
a	O
128-bit	O
key	O
,	O
which	O
consists	O
of	O
120	O
key	O
bits	O
and	O
an	O
8-bit	O
checksum	O
.	O
</s>
<s>
Furthermore	O
,	O
it	O
is	O
known	O
that	O
SAVILLE	B-Algorithm
has	O
two	O
modes	O
of	O
operation	O
:	O
Autonomous	O
Mode	O
(	O
also	O
known	O
as	O
Key-Auto-KEY	O
or	O
KAK	O
)	O
and	O
Autoclave	O
Mode	O
(	O
also	O
known	O
as	O
Cipher-Text	O
Auto	O
Key	O
or	O
CTAK	O
)	O
.	O
</s>
<s>
On	O
the	O
AIM	O
microchip	B-Architecture
,	O
it	O
runs	O
at	O
4%	O
of	O
the	O
clock	O
rate	O
(	O
compare	O
DES	B-Algorithm
at	O
76%	O
and	O
BATON	B-Algorithm
at	O
129%	O
)	O
.	O
</s>
<s>
The	O
Cypris	O
chip	O
mentions	O
two	O
modes	O
;	O
specifications	O
for	O
Windster	O
and	O
Indictor	O
specify	O
that	O
they	O
provide	O
Saville	B-Algorithm
I	O
.	O
</s>
<s>
Some	O
devices	O
and	O
protocols	O
that	O
implement	O
SAVILLE	B-Algorithm
:	O
</s>
