<s>
The	O
Host	B-Protocol
Identity	I-Protocol
Protocol	I-Protocol
(	O
HIP	O
)	O
is	O
a	O
host	O
identification	O
technology	O
for	O
use	O
on	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
networks	O
,	O
such	O
as	O
the	O
Internet	O
.	O
</s>
<s>
The	O
Internet	O
has	O
two	O
main	O
name	O
spaces	O
,	O
IP	B-Protocol
addresses	I-Protocol
and	O
the	O
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
.	O
</s>
<s>
HIP	O
separates	O
the	O
end-point	O
identifier	O
and	O
locator	O
roles	O
of	O
IP	B-Protocol
addresses	I-Protocol
.	O
</s>
<s>
It	O
introduces	O
a	O
Host	O
Identity	O
(	O
HI	O
)	O
name	O
space	O
,	O
based	O
on	O
a	O
public	B-Application
key	I-Application
security	O
infrastructure	O
.	O
</s>
<s>
The	O
Host	B-Protocol
Identity	I-Protocol
Protocol	I-Protocol
provides	O
secure	O
methods	O
for	O
IP	O
multihoming	B-Protocol
and	O
mobile	O
computing	O
.	O
</s>
<s>
In	O
networks	O
that	O
implement	O
the	O
Host	B-Protocol
Identity	I-Protocol
Protocol	I-Protocol
,	O
all	O
occurrences	O
of	O
IP	B-Protocol
addresses	I-Protocol
in	O
applications	O
are	O
eliminated	O
and	O
replaced	O
with	O
cryptographic	O
host	O
identifiers	O
.	O
</s>
<s>
The	O
effect	O
of	O
eliminating	O
IP	B-Protocol
addresses	I-Protocol
in	O
application	O
and	O
transport	O
layers	O
is	O
a	O
decoupling	O
of	O
the	O
transport	O
layer	O
from	O
the	O
internetworking	O
layer	O
(	O
Internet	B-Protocol
Layer	I-Protocol
)	O
in	O
TCP/IP	B-Protocol
.	O
</s>
