<s>
The	O
Neuman	B-Protocol
–	I-Protocol
Stubblebine	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
,	O
the	O
Internet	O
)	O
.	O
</s>
<s>
If	O
Alice	O
(	O
A	O
)	O
initiates	O
the	O
communication	O
to	O
Bob	O
(	O
B	O
)	O
with	O
S	O
is	O
a	O
server	O
trusted	O
by	O
both	O
parties	O
,	O
the	O
protocol	O
can	O
be	O
specified	O
as	O
follows	O
using	O
security	B-General_Concept
protocol	I-General_Concept
notation	I-General_Concept
:	O
</s>
<s>
Using	O
the	O
theorem	O
prover	O
SPASS	B-Application
it	O
has	O
been	O
shown	O
that	O
this	O
protocol	O
can	O
be	O
attacked	O
.	O
</s>
