iron box

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}.