<s>
File	B-General_Concept
fixity	I-General_Concept
is	O
a	O
digital	O
preservation	O
term	O
referring	O
to	O
the	O
property	O
of	O
a	O
digital	O
file	O
being	O
fixed	O
,	O
or	O
unchanged	O
.	O
</s>
<s>
In	O
practice	O
,	O
a	O
fixity	O
check	O
is	O
most	O
often	O
accomplished	O
by	O
computing	O
checksum	B-Algorithm
or	O
cryptographic	B-Algorithm
hash	I-Algorithm
function	I-Algorithm
values	O
for	O
a	O
file	O
and	O
comparing	O
them	O
to	O
a	O
stored	O
value	O
or	O
through	O
digital	O
signatures	O
.	O
</s>
<s>
File	B-General_Concept
fixity	I-General_Concept
figures	O
prominently	O
in	O
Preservation	O
Metadata	O
:	O
Implementation	O
Strategies	O
(	O
PREMIS	O
)	O
,	O
the	O
Government	O
Printing	O
Office	O
's	O
work	O
on	O
the	O
Authenticity	O
of	O
Electronic	O
Federal	O
Government	O
Publications	O
,	O
and	O
fixity	O
checking	O
practices	O
are	O
used	O
by	O
a	O
range	O
of	O
cultural	O
heritage	O
organizations	O
.	O
</s>
