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- Path: sparky!uunet!usc!wupost!spool.mu.edu!telecom-request
- Date: 3 Jan 93 14:01:32 EST (Sun)
- From: johnl@iecc.cambridge.ma.us (John R. Levine)
- Newsgroups: comp.dcom.telecom
- Subject: Re: Good Opportunity For Fraud
- Message-ID: <telecom13.7.7@eecs.nwu.edu>
- Organization: I.E.C.C.
- Sender: Telecom@eecs.nwu.edu
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 13, Issue 7, Message 7 of 13
- Lines: 47
-
- Hey, I'm following up my own note. Isn't there a physical law or
- something to prevent this?
-
- > [Moderator's Note: But please note there is also something on the card
- > which provides for a so-called 'overnight limit'.
-
- The $100 when the network is down is a nice feature, but not one that
- is widely available. Around here, when the network goes down,
- machines put up the CLOSED sign. That's one of the reasons I have six
- ATM cards in my wallet from four different banks.
-
- Citibank machines in New York City at least used to have a similar
- feature. For a long time, over a year, someone who clearly had inside
- information was using an old invalid Citicard to make $100 withdrawals
- from machines all over the city when the machines were offline while
- their network nodes were down for maintenance. The maintenance
- schedule was deliberately erratic and quite secret. Had the guy used
- the card even once in an on-line machine the card would have been
- eaten and that would have been that. I never heard whether they
- managed to catch him. I'd think that it would have been
- straightforward to set up a sting to catch him in the act.
-
-
- Regards,
-
- John Levine, johnl@iecc.cambridge.ma.us, {spdcc|ima|world}!iecc!johnl
-
-
- [Moderator's Note: I think the banks here which give money on trust
- when the network is down do have something called a 'negative listing'
- of cards which should not be honored in that way. Here in the Chicago
- area, the First National Bank operates the Cash Station computer (as
- well as their own, of course), so using one of their cards at one of
- their own machines is a bit different than using their card at a
- machine which is only on line occassionally, etc. Some machines here
- seem to only contact the main system once a day during the night.
- Those machines have a record of whatever the system told them from the
- night before, and they go by those figures all day. I know when I
- asked the Devon Bank about this, they specifically stated their cash
- station was NOT on line all the time. They can deal with their own
- customers records at all times; they get the rest of the records
- whenever they do. Clever people have found ways to get some float out
- of the cash machines over holiday periods, etc, knowing they won't
- actually see the transaction on their own account for two or three
- days in the event of a three day weekend. PAT]
-
-