<s>
The	O
swIPe	B-Protocol
IP	I-Protocol
Security	I-Protocol
Protocol	I-Protocol
(	O
swIPe	B-Protocol
)	O
is	O
an	O
experimental	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
security	O
protocol	O
that	O
was	O
specified	O
in	O
1993	O
.	O
</s>
<s>
It	O
operates	O
at	O
the	O
Internet	B-Protocol
Layer	I-Protocol
of	O
the	O
Internet	B-Protocol
Protocol	I-Protocol
Suite	I-Protocol
.	O
</s>
<s>
swIPe	B-Protocol
provides	O
confidentiality	O
,	O
integrity	O
,	O
and	O
authentication	O
of	O
network	O
traffic	O
,	O
and	O
can	O
be	O
used	O
to	O
provide	O
both	O
end-to-end	O
and	O
intermediate-hop	O
security	O
.	O
</s>
<s>
swIPe	B-Protocol
is	O
concerned	O
only	O
with	O
security	O
mechanisms	O
.	O
</s>
<s>
swIPe	B-Protocol
encapsulates	O
each	O
IP	O
datagram	O
to	O
be	O
secured	O
inside	O
a	O
swIPe	B-Protocol
packet	O
.	O
</s>
<s>
A	O
swIPe	B-Protocol
packet	O
is	O
an	O
IP	O
packet	O
of	O
protocol	O
type	O
53	O
.	O
</s>
<s>
A	O
swIPe	B-Protocol
packet	O
starts	O
with	O
a	O
header	O
,	O
which	O
contains	O
identifying	O
data	O
and	O
authentication	O
information	O
;	O
the	O
header	O
is	O
followed	O
by	O
the	O
original	O
IP	O
datagram	O
,	O
which	O
in	O
turn	O
is	O
followed	O
by	O
any	O
padding	O
required	O
by	O
the	O
security	O
processing	O
.	O
</s>
<s>
Depending	O
on	O
the	O
negotiated	O
policy	O
,	O
the	O
sensitive	O
part	O
of	O
the	O
swIPe	B-Protocol
packet	O
(	O
the	O
authentication	O
information	O
and	O
the	O
original	O
IP	O
datagram	O
)	O
may	O
be	O
encrypted	O
.	O
</s>
<s>
Cisco	O
routers	O
and	O
switches	O
running	O
IOS	O
have	O
been	O
found	O
vulnerable	O
to	O
denial	O
of	O
service	O
(	O
DoS	O
)	O
attacks	O
which	O
may	O
result	O
from	O
processing	O
packets	O
with	O
IP	B-Protocol
Protocol	I-Protocol
53	O
.	O
</s>
