<s>
Nautilus	B-Protocol
is	O
a	O
program	O
which	O
allows	O
two	O
parties	O
to	O
securely	O
communicate	O
using	O
modems	O
or	O
TCP/IP	O
.	O
</s>
<s>
It	O
runs	O
from	O
a	O
command	O
line	O
and	O
is	O
available	O
for	O
the	O
Linux	B-Application
and	O
Windows	B-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
The	O
name	O
was	O
based	O
upon	O
Jules	O
Verne	O
's	O
Nautilus	B-Protocol
and	O
its	O
ability	O
to	O
overcome	O
a	O
Clipper	O
ship	O
as	O
a	O
play	O
on	O
Clipper	O
chip	O
.	O
</s>
<s>
Nautilus	B-Protocol
is	O
historically	O
significant	O
in	O
the	O
realm	O
of	O
secure	O
communications	O
because	O
it	O
was	O
one	O
of	O
the	O
first	O
programs	O
which	O
were	O
released	O
as	O
open	O
source	O
to	O
the	O
general	O
public	O
which	O
used	O
strong	O
encryption	O
.	O
</s>
<s>
Once	O
this	O
program	O
and	O
another	O
similar	O
program	O
PGPfone	B-General_Concept
were	O
available	O
on	O
the	O
internet	O
,	O
the	O
proverbial	O
cat	O
was	O
"	O
out	O
of	O
the	O
bag	O
"	O
and	O
it	O
would	O
have	O
been	O
nearly	O
impossible	O
to	O
stop	O
the	O
use	O
of	O
strong	O
encryption	O
for	O
telephone	O
communications	O
.	O
</s>
