<s>
In	O
some	O
computer	O
security	O
systems	O
,	O
a	O
Ticket	B-Protocol
Granting	I-Protocol
Ticket	I-Protocol
or	O
Ticket	O
to	O
Get	O
Tickets	O
(	O
TGT	O
)	O
is	O
a	O
small	O
,	O
encrypted	O
identification	O
file	O
with	O
a	O
limited	O
validity	O
period	O
.	O
</s>
<s>
After	O
authentication	O
,	O
this	O
file	O
is	O
granted	O
to	O
a	O
user	O
for	O
data	O
traffic	O
protection	O
by	O
the	O
key	O
distribution	O
center	O
(	O
KDC	O
)	O
subsystem	O
of	O
authentication	O
services	O
such	O
as	O
Kerberos	B-Protocol
.	O
</s>
<s>
The	O
TGT	O
file	O
contains	O
the	O
session	O
key	O
,	O
its	O
expiration	O
date	O
,	O
and	O
the	O
user	O
's	O
IP	B-Protocol
address	I-Protocol
,	O
which	O
protects	O
the	O
user	O
from	O
man-in-the-middle	O
attacks	O
.	O
</s>
