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}.