<s>
Balloon	B-Algorithm
hashing	I-Algorithm
is	O
a	O
key	B-Algorithm
derivation	I-Algorithm
function	I-Algorithm
presenting	O
proven	O
memory-hard	O
password-hashing	O
and	O
modern	O
design	O
.	O
</s>
<s>
is	O
built	O
from	O
standard	O
primitives	O
:	O
it	O
can	O
use	O
any	O
standards	O
non-space-hard	O
cryptographic	B-Algorithm
hash	I-Algorithm
function	I-Algorithm
as	O
a	O
sub-algorithm	O
(	O
e.g.	O
,	O
SHA-3	B-Algorithm
,	O
SHA-512	B-Algorithm
)	O
,	O
</s>
<s>
Balloon	O
is	O
compared	O
by	O
its	O
authors	O
with	O
Argon2	B-Algorithm
,	O
a	O
similarly	O
performing	O
algorithm	O
.	O
</s>
<s>
Expansion	O
,	O
where	O
an	O
initial	O
buffer	O
is	O
filled	O
with	O
a	O
pseudorandom	B-Error_Name
byte	O
sequence	O
derived	O
from	O
the	O
password	O
and	O
salt	O
repeatedly	O
hashed	O
.	O
</s>
