iron box

from Jargon File (4.4.4, 14 Aug 2003)
iron box
 n.

   [Unix/Internet] A special environment set up to trap a {cracker}
   logging in over remote connections long enough to be traced. May
   include a modified {shell} restricting the cracker's movements in
   unobvious ways, and `bait' files designed to keep him interested and
   logged on. See also {back door}, {firewall machine}, {Venus flytrap},
   and Clifford Stoll's account in The Cuckoo's Egg of how he made and
   used one (see the Bibliography in Appendix C). Compare {padded cell},
   {honey pot}.
    
from The Free On-line Dictionary of Computing (8 July 2008)
iron box

   [Unix/Internet] A special environment set up to trap a
   {cracker} logging in over remote connections long enough to be
   traced.  May include a modified {shell} restricting the
   cracker's movements in unobvious ways, and "bait" files
   designed to keep him interested and logged on.  See also {back
   door}, {firewall machine}, {Venus flytrap}, and Clifford
   Stoll's account in "{The Cuckoo's Egg}" of how he made and
   used one.  Compare {padded cell}.

   [{Jargon File}]
    

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