<s>
The	O
Otway	B-Protocol
–	I-Protocol
Rees	I-Protocol
protocol	I-Protocol
is	O
a	O
computer	B-Architecture
network	I-Architecture
authentication	O
protocol	O
designed	O
for	O
use	O
on	O
insecure	O
networks	O
(	O
e.g.	O
</s>
<s>
The	O
protocol	O
can	O
be	O
specified	O
as	O
follows	O
in	O
security	B-General_Concept
protocol	I-General_Concept
notation	I-General_Concept
,	O
where	O
Alice	O
is	O
authenticating	O
herself	O
to	O
Bob	O
using	O
a	O
server	O
S	O
(	O
M	O
is	O
a	O
session-identifier	O
,	O
NA	O
and	O
NB	O
are	O
nonces	O
)	O
:	O
</s>
