<s>
Ophcrack	B-Application
is	O
a	O
free	B-Application
open-source	B-Application
(	O
GPL	B-License
licensed	O
)	O
program	O
that	O
cracks	O
Windows	B-Application
log-in	O
passwords	O
by	O
using	O
LM	O
hashes	O
through	O
rainbow	B-Algorithm
tables	I-Algorithm
.	O
</s>
<s>
The	O
program	O
includes	O
the	O
ability	O
to	O
import	O
the	O
hashes	O
from	O
a	O
variety	O
of	O
formats	O
,	O
including	O
dumping	O
directly	O
from	O
the	O
SAM	O
files	O
of	O
Windows	B-Application
.	O
</s>
<s>
On	O
most	O
computers	O
,	O
ophcrack	B-Application
can	O
crack	O
most	O
passwords	O
within	O
a	O
few	O
minutes	O
.	O
</s>
<s>
Rainbow	B-Algorithm
tables	I-Algorithm
for	O
LM	O
hashes	O
are	O
provided	O
for	O
free	B-Application
by	O
the	O
developers	O
.	O
</s>
<s>
By	O
default	O
,	O
ophcrack	B-Application
is	O
bundled	O
with	O
tables	O
that	O
allow	O
it	O
to	O
crack	O
passwords	O
no	O
longer	O
than	O
14	O
characters	O
using	O
only	O
alphanumeric	O
characters	O
.	O
</s>
<s>
Available	O
for	O
free	B-Application
download	O
are	O
four	O
Windows	B-Application
XP	O
tables	O
and	O
four	O
Windows	B-Application
Vista	I-Application
tables	O
.	O
</s>
<s>
Larger	O
rainbow	B-Algorithm
tables	I-Algorithm
are	O
NTLM	O
hash	O
for	O
cracking	O
Windows	O
Vista/Windows	O
7	O
.	O
</s>
<s>
Ophcrack	B-Application
is	O
also	O
available	O
as	O
Live	O
CD	O
distributions	O
,	O
which	O
automates	O
the	O
retrieval	O
,	O
decryption	O
,	O
and	O
cracking	O
of	O
passwords	O
from	O
a	O
Windows	B-Application
system	O
.	O
</s>
<s>
One	O
Live	O
CD	O
distribution	O
is	O
available	O
for	O
Windows	B-Application
XP	O
and	O
lower	O
and	O
another	O
for	O
Windows	B-Application
Vista	I-Application
and	O
Windows	B-Device
7	I-Device
.	O
</s>
<s>
The	O
Live	O
CD	O
distributions	O
of	O
ophcrack	B-Application
are	O
built	O
with	O
SliTaz	O
GNU/Linux	B-Application
.	O
</s>
<s>
Starting	O
with	O
version	O
2.3	O
,	O
Ophcrack	B-Application
also	O
cracks	O
NTLM	O
hashes	O
.	O
</s>
<s>
This	O
is	O
necessary	O
if	O
the	O
generation	O
of	O
the	O
LM	O
hash	O
is	O
disabled	O
(	O
this	O
is	O
default	O
for	O
Windows	B-Application
Vista	I-Application
)	O
or	O
if	O
the	O
password	O
is	O
longer	O
than	O
14	O
characters	O
(	O
in	O
which	O
case	O
the	O
LM	O
hash	O
is	O
not	O
stored	O
)	O
.	O
</s>
