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- From: johnl@iecc.cambridge.ma.us (John R. Levine)
- Newsgroups: comp.dcom.telecom
- Subject: Re: Good Opportunity For Fraud
- Message-ID: <telecom13.6.2@eecs.nwu.edu>
- Date: 3 Jan 93 15:55:43 GMT
- Sender: Telecom@eecs.nwu.edu
- Organization: I.E.C.C.
- Lines: 45
- 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 6, Message 2 of 10
-
- > Or do the ATMs check with the central computer each time (hope the
- > traffic is encrypted.)
-
- Of course they do. How else could they know whether there was any
- money in your account? Some early ATMs were standalone or
- semi-standalone with lists of bad account numbers downloaded into
- them, so the cards they used either had the PIN on the magstripe or
- computed the PIN from the account number. These days, all machines
- are online (they look to the host like 3278 terminals) so there's no
- need to have the PIN on the card.
-
- Whether they encrypt the traffic is a good question. Banks are big
- believers in security through obscurity so they get very touchy
- whenever you ask a technical question about their ATMs. I've even
- been asked to move out of the line of sight when I was standing near
- an ATM in the bank lobby as they were servicing it. In fairness, I
- suppose they wanted to be sure I didn't see them dial the combination
- lock on the ATM's safe.
-
-
- Regards,
-
- John Levine, johnl@iecc.cambridge.ma.us, {spdcc|ima|world}!iecc!johnl
-
-
- [Moderator's Note: But please note there is also something on the card
- which provides for a so-called 'overnight limit'. I have a Cash Station
- card connected with CIRRUS. I also have a 'Banking Card' from First
- National Bank in Chicago which functions as a debit card. It has a
- Master Card logo on it and can be used wherever credit cards are used,
- except that it makes a direct debit to my checking account. It is
- also hooked into CIRRUS. On occassion -- but it is growing more and
- more rare -- the network will be 'down'. When this is the case, a cash
- machine will give me up to $100 *because I ask for it*, without any
- verification. Once the network is back up, the transaction will be
- processed when the tapes are updated that night. If there is not
- enough money in the account, and either one party or the other gets
- paid, rest assured the bank recovers their money first. A Cash Station
- transaction which itself cannot be cleared later from lack of funds is
- a Very Bad Thing, and that card will have a hold on it not only until
- the money gets deposited to clear it but until 'someone' calls the
- bank collection department to plead their case. First offense, okay;
- second or third offense (of causing an overdraft because Cash Station
- was down when you took the money you didn't have) is Bad News. PAT]
-