<s>
Password	B-Language
Safe	I-Language
is	O
a	O
free	B-License
and	I-License
open-source	I-License
password	O
manager	O
program	O
originally	O
written	O
for	O
Microsoft	B-Application
Windows	I-Application
but	O
supporting	O
wide	O
area	O
of	O
operating	O
systems	O
with	O
compatible	O
clients	O
available	O
for	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
,	O
Android	B-Application
,	O
IOS	B-Application
,	O
BlackBerry	B-Operating_System
and	O
other	O
operating	O
systems	O
as	O
well	O
.	O
</s>
<s>
The	O
Linux	B-Application
version	O
is	O
available	O
for	O
Ubuntu	B-Operating_System
(	O
including	O
the	O
Kubuntu	B-Application
and	O
Xubuntu	B-Application
derivatives	O
)	O
and	O
Debian	O
.	O
</s>
<s>
A	O
Java-based	O
version	O
is	O
also	O
available	O
on	O
SourceForge	B-Application
.	O
</s>
<s>
On	O
its	O
page	O
,	O
users	O
can	O
find	O
links	O
to	O
unofficial	O
releases	O
running	O
under	O
Android	B-Application
,	O
BlackBerry	B-Operating_System
,	O
and	O
other	O
mobile	O
operating	O
systems	O
.	O
</s>
<s>
The	O
program	O
was	O
initiated	O
by	O
Bruce	O
Schneier	O
at	O
Counterpane	O
Systems	O
,	O
and	O
is	O
now	O
hosted	O
on	O
SourceForge	B-Application
(	O
Windows	O
)	O
and	O
GitHub	B-Application
(	O
Linux	B-Application
)	O
and	O
developed	O
by	O
a	O
group	O
of	O
volunteers	O
.	O
</s>
<s>
Password	B-Language
Safe	I-Language
does	O
not	O
support	O
database	O
sharing	O
,	O
but	O
the	O
single-file	O
database	O
can	O
be	O
shared	O
by	O
any	O
external	O
sharing	O
method	O
(	O
for	O
example	O
Syncthing	B-Language
,	O
Dropbox	B-Application
etc	O
.	O
)	O
.	O
</s>
<s>
Stored	O
passwords	O
can	O
be	O
sectioned	O
into	O
groups	O
and	O
subgroups	O
in	O
a	O
tree	B-Data_Structure
structure	I-Data_Structure
.	O
</s>
<s>
The	O
password	O
list	O
can	O
be	O
exported	O
to	O
various	O
file	O
formats	O
including	O
TXT	B-General_Concept
,	O
XML	B-Protocol
and	O
previous	O
versions	O
of	O
Password	B-Language
Safe	I-Language
.	O
</s>
<s>
Password	B-Language
Safe	I-Language
supports	O
importing	O
TXT	B-General_Concept
and	O
CSV	O
files	O
which	O
were	O
exported	O
from	O
KeePass	B-Language
version	O
1.x	O
(	O
V1	O
)	O
.	O
</s>
<s>
KeePass	B-Language
version	O
2.x	O
(	O
V2	O
)	O
allows	O
databases	O
to	O
be	O
exported	O
as	O
a	O
KeePass	B-Language
V1	O
database	O
,	O
which	O
in	O
turn	O
can	O
be	O
imported	O
to	O
Password	B-Language
Safe	I-Language
.	O
</s>
<s>
Password	B-Language
Safe	I-Language
cannot	O
directly	O
import	O
an	O
XML	B-Protocol
file	O
exported	O
by	O
KeePass	B-Language
V1	O
or	O
V2	O
,	O
as	O
the	O
fields	O
are	O
too	O
different	O
.	O
</s>
<s>
However	O
,	O
the	O
Help	O
file	O
provides	O
instructions	O
for	O
processing	O
an	O
exported	O
XML	B-Protocol
file	O
with	O
one	O
of	O
multiple	O
XSLT	B-Application
files	O
(	O
included	O
with	O
Password	B-Language
Safe	I-Language
)	O
which	O
will	O
produce	O
a	O
Password	B-Language
Safe	I-Language
compatible	O
XML	B-Protocol
file	O
that	O
can	O
then	O
be	O
imported	O
.	O
</s>
<s>
Password	B-Language
Safe	I-Language
can	O
encrypt	O
any	O
file	O
using	O
a	O
key	O
derived	O
from	O
a	O
passphrase	O
provided	O
by	O
the	O
user	O
through	O
the	O
command-line	B-Application
interface	I-Application
.	O
</s>
<s>
The	O
original	O
Password	B-Language
Safe	I-Language
was	O
built	O
on	O
Bruce	O
Schneier	O
's	O
Blowfish	B-Algorithm
encryption	I-Algorithm
algorithm	I-Algorithm
.	O
</s>
<s>
Rony	O
Shapiro	O
implemented	O
Twofish	B-Algorithm
encryption	O
along	O
with	O
other	O
improvements	O
to	O
the	O
3.xx	O
series	O
of	O
Password	B-Language
Safe	I-Language
.	O
</s>
<s>
The	O
keys	O
are	O
derived	O
using	O
an	O
equivalent	O
of	O
PBKDF2	O
with	O
SHA-256	B-Algorithm
and	O
a	O
configurable	O
number	O
of	O
iterations	O
,	O
currently	O
set	O
at	O
2048	O
.	O
</s>
<s>
In	O
a	O
paper	O
analysing	O
various	O
database	O
formats	O
of	O
password	O
storage	O
programs	O
for	O
security	O
vulnerabilities	O
the	O
researchers	O
have	O
found	O
that	O
the	O
format	O
used	O
by	O
Password	B-Language
Safe	I-Language
(	O
version	O
3	O
format	O
)	O
was	O
the	O
most	O
resistant	O
to	O
various	O
cryptographic	O
attacks	O
.	O
</s>
