<s>
RadSec	B-Protocol
is	O
a	O
protocol	O
for	O
transporting	O
RADIUS	B-Protocol
datagrams	B-Protocol
over	O
TCP	B-Protocol
and	O
TLS	B-Protocol
.	O
</s>
<s>
The	O
RADIUS	B-Protocol
protocol	O
is	O
a	O
widely	O
deployed	O
authentication	O
and	O
authorization	O
protocol	O
.	O
</s>
<s>
The	O
supplementary	O
RADIUS	B-Protocol
Accounting	O
specification	O
also	O
provides	O
accounting	O
mechanisms	O
,	O
thus	O
delivering	O
a	O
full	O
AAA	O
protocol	O
solution	O
.	O
</s>
<s>
However	O
,	O
RADIUS	B-Protocol
is	O
experiencing	O
two	O
major	O
shortcomings	O
as	O
time	O
passes	O
since	O
its	O
initial	O
design	O
:	O
its	O
dependency	O
on	O
the	O
unreliable	O
transport	B-Architecture
protocol	I-Architecture
UDP	B-Protocol
and	O
the	O
lack	O
of	O
security	O
for	O
large	O
parts	O
of	O
its	O
packet	O
payload	O
.	O
</s>
<s>
Specifically	O
,	O
for	O
the	O
latter	O
,	O
RADIUS	B-Protocol
security	O
is	O
based	O
on	O
the	O
MD5	B-Algorithm
algorithm	O
,	O
which	O
has	O
been	O
proven	O
to	O
be	O
insecure	O
.	O
</s>
<s>
The	O
main	O
focus	O
of	O
RadSec	B-Protocol
is	O
to	O
provide	O
a	O
means	O
to	O
secure	O
the	O
communication	O
between	O
RADIUS/TCP	O
peers	O
on	O
the	O
transport	B-Architecture
layer	I-Architecture
.	O
</s>
<s>
The	O
most	O
important	O
use	O
of	O
RadSec	B-Protocol
lies	O
in	O
roaming	O
environments	O
where	O
RADIUS	B-Protocol
packets	O
need	O
to	O
be	O
transferred	O
through	O
different	O
administrative	O
domains	O
and	O
untrusted	O
,	O
potentially	O
hostile	O
networks	O
.	O
</s>
<s>
An	O
example	O
for	O
a	O
world-wide	O
roaming	O
environment	O
that	O
uses	O
RadSec	B-Protocol
to	O
secure	O
communication	O
is	O
eduroam	O
.	O
</s>
<s>
The	O
"	O
RADIUS	B-Protocol
Extensions	O
"	O
working	O
group	O
of	O
the	O
Internet	O
Engineering	O
Task	O
Force	O
(	O
IETF	O
)	O
specified	O
RadSec	B-Protocol
in	O
.	O
</s>
