<s>
In	O
cryptography	O
,	O
CDMF	B-Algorithm
(	O
Commercial	B-Algorithm
Data	I-Algorithm
Masking	I-Algorithm
Facility	I-Algorithm
)	O
is	O
an	O
algorithm	O
developed	O
at	O
IBM	O
in	O
1992	O
to	O
reduce	O
the	O
security	O
strength	O
of	O
the	O
56-bit	O
DES	B-Algorithm
cipher	O
to	O
that	O
of	O
40-bit	O
encryption	O
,	O
at	O
the	O
time	O
a	O
requirement	O
of	O
U.S.	O
restrictions	O
on	O
export	O
of	O
cryptography	O
.	O
</s>
<s>
Rather	O
than	O
a	O
separate	O
cipher	O
from	O
DES	B-Algorithm
,	O
CDMF	B-Algorithm
constitutes	O
a	O
key	O
generation	O
algorithm	O
,	O
called	O
key	O
shortening	O
.	O
</s>
<s>
It	O
is	O
one	O
of	O
the	O
cryptographic	O
algorithms	O
supported	O
by	O
S-HTTP	B-Protocol
.	O
</s>
<s>
Like	O
DES	B-Algorithm
,	O
CDMF	B-Algorithm
accepts	O
a	O
64-bit	O
input	O
key	O
,	O
but	O
not	O
all	O
bits	O
are	O
used	O
.	O
</s>
<s>
Clear	O
bits	O
8	O
,	O
16	O
,	O
24	O
,	O
32	O
,	O
40	O
,	O
48	O
,	O
56	O
,	O
64	O
(	O
ignoring	O
these	O
bits	O
as	O
DES	B-Algorithm
does	O
)	O
.	O
</s>
<s>
XOR	B-Application
the	O
result	O
with	O
its	O
encryption	O
under	O
DES	B-Algorithm
using	O
the	O
key	O
0xC408B0540BA1E0AE	O
.	O
</s>
<s>
Encrypt	O
the	O
result	O
under	O
DES	B-Algorithm
using	O
the	O
key	O
0xEF2C041CE6382FE6	O
.	O
</s>
<s>
The	O
resulting	O
64-bit	O
data	O
is	O
to	O
be	O
used	O
as	O
a	O
DES	B-Algorithm
key	O
.	O
</s>
