<s>
Master	B-Application
Password	I-Application
is	O
a	O
type	O
of	O
algorithm	O
first	O
implemented	O
by	O
Maarten	O
Billemont	O
for	O
creating	O
unique	O
passwords	O
in	O
a	O
reproducible	O
manner	O
.	O
</s>
<s>
It	O
differs	O
from	O
traditional	O
password	O
managers	O
in	O
that	O
the	O
passwords	O
are	O
not	O
stored	O
on	O
disk	O
or	O
in	O
the	O
cloud	O
,	O
but	O
are	O
regenerated	O
every	O
time	O
from	O
information	O
entered	O
by	O
the	O
user	O
:	O
Their	O
name	O
,	O
a	O
master	B-Application
password	I-Application
,	O
and	O
a	O
unique	O
identifier	O
for	O
the	O
service	O
the	O
password	O
is	O
intended	O
for	O
(	O
usually	O
the	O
URL	O
)	O
.	O
</s>
<s>
In	O
Billemont	O
's	O
implementation	O
,	O
the	O
master	O
key	O
is	O
a	O
global	O
64-byte	O
secret	O
key	O
generated	O
from	O
the	O
user	O
's	O
secret	O
master	B-Application
password	I-Application
and	O
salted	O
by	O
their	O
full	O
name	O
.	O
</s>
<s>
The	O
salt	O
is	O
used	O
to	O
avoid	O
attacks	O
based	O
on	O
rainbow	B-Algorithm
tables	I-Algorithm
.	O
</s>
<s>
The	O
scrypt	B-Algorithm
algorithm	O
,	O
an	O
intentionally	O
slow	O
key	B-Algorithm
derivation	I-Algorithm
function	I-Algorithm
,	O
is	O
used	O
for	O
generating	O
the	O
master	O
key	O
to	O
make	O
a	O
brute-force	O
attack	O
infeasible	O
.	O
</s>
<s>
The	O
template	O
seed	O
is	O
a	O
site-specific	O
secret	O
in	O
binary	O
form	O
,	O
generated	O
from	O
the	O
master	O
key	O
,	O
the	O
site	O
name	O
and	O
the	O
counter	O
using	O
the	O
HMAC-SHA256	B-Algorithm
algorithm	O
.	O
</s>
<s>
Billemont	O
also	O
created	O
multiple	O
free	B-Application
software	I-Application
implementations	O
of	O
the	O
Master	B-Application
Password	I-Application
algorithm	O
,	O
licensed	O
under	O
the	O
GPLv3	O
.	O
</s>
<s>
An	O
app	O
for	O
iOS	B-Application
.	O
</s>
<s>
The	O
iOS	B-Application
implementation	O
was	O
first	O
released	O
in	O
2012	O
.	O
</s>
<s>
A	O
web	O
client	O
written	O
in	O
JavaScript	B-Language
.	O
</s>
