<s>
In	O
IT	O
security	O
,	O
a	O
ticket	B-General_Concept
is	O
a	O
number	O
generated	O
by	O
a	O
network	B-Application
server	I-Application
for	O
a	O
client	B-Protocol
,	O
which	O
can	O
be	O
delivered	O
to	O
itself	O
,	O
or	O
a	O
different	O
server	B-Application
as	O
a	O
means	O
of	O
authentication	O
or	O
proof	O
of	O
authorization	O
,	O
and	O
cannot	O
easily	O
be	O
forged	O
.	O
</s>
<s>
This	O
usage	O
of	O
the	O
word	O
originated	O
with	O
MIT	O
's	O
Kerberos	B-Protocol
protocol	I-Protocol
in	O
the	O
1980s	O
.	O
</s>
<s>
Tickets	B-General_Concept
may	O
either	O
be	O
transparent	O
,	O
meaning	O
they	O
can	O
be	O
recognized	O
without	O
contacting	O
the	O
server	B-Application
that	O
generated	O
them	O
;	O
or	O
opaque	O
,	O
meaning	O
the	O
original	O
server	B-Application
must	O
be	O
contacted	O
to	O
verify	O
that	O
it	O
issued	O
the	O
ticket	B-General_Concept
.	O
</s>
<s>
Some	O
magic	O
cookies	O
provide	O
the	O
same	O
functionality	O
as	O
a	O
ticket	B-General_Concept
.	O
</s>
