<s>
In	O
modern	O
cryptography	O
,	O
null	B-Algorithm
encryption	I-Algorithm
(	O
or	O
selecting	O
null	O
cipher	O
or	O
NONE	O
cipher	O
)	O
is	O
choosing	O
not	O
to	O
use	O
encryption	O
in	O
a	O
system	O
where	O
various	O
encryption	O
options	O
are	O
offered	O
.	O
</s>
<s>
Examples	O
of	O
this	O
are	O
the	O
"	O
eNULL	O
"	O
and	O
"	O
aNULL	O
"	O
cipher	O
suite	O
in	O
OpenSSL	B-Language
,	O
and	O
the	O
"	O
NULL	B-Algorithm
Encryption	I-Algorithm
Algorithm	O
"	O
in	O
IPSec	B-Protocol
.	O
</s>
