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- Path: sparky!uunet!paladin.american.edu!howland.reston.ans.net!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!telecom-request
- Date: Sun, 03 Jan 1993 05:05:45 EST
- From: FZC@CU.NIH.GOV
- Newsgroups: comp.dcom.telecom
- Subject: Re: Good Opportunity For Fraud
- Reply-To: TDARCOS@MCIMAIL.COM
- Message-ID: <telecom13.6.1@eecs.nwu.edu>
- Organization: TELECOM Digest
- 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 6, Message 1 of 10
- Lines: 46
-
- In TELECOM Digest 12-928, cgordon@vpnet.chi.il.us (gordon hlavenka)
- writes:
-
- > I've been working on a credit card / phone project, and
- > discovered something that is probably known to many but was
- > news to me: My PIN is _on_ my calling card! Recorded on
- > Track 2, offset 23 characters after the SS. In the clear.
-
- [Stuff Deleted]
-
- > I suppose it could be argued that validating PINs on-line
- > is a difficult task, but on the other hand my ATM card works
- > in London and if the PIN is recorded on this card it's
- > encrypted ...
-
- It's not. The interesting thing is that banks operate almost
- identically the way Internet does for handling TELNET or FTP or E-Mail
- requests. One computer calls up another computer through several
- intervening computer systems over the backbone.
-
- In the case of Internet, the backbone is supplied by NSF in the U.S.
- and by the local PTTs in foreign countries.
-
- If you look at your card, it will identify the 'backbone' supplier; a
- name like 'CIRRUS' (owned by Master Card) or 'PLUS' (owned by Visa).
- These are the two major international ATM networks. This backbone
- establishes a connection between the bank you are at and the one you
- have an account with. This bank sends across the card number your
- card has and sends across the PIN that you type in, along with a
- statement of what you want it to do (send money, send your balance,
- etc.) The receiving computer gets this information and then decides
- what to do with it just as if you were at one of its own machines.
- Then it will either send back some information (account balance) or an
- approval (give him the $300) or a denial (sorry, he doesn't have
- enough) or in worse case, a rejection (refuse his request and eat the
- card).
-
- In short, the local bank simply sends the information you gave it (in
- encrypted form) back to the issuing bank; the local bank simply
- follows instructions.
-
-
- Paul Robinson -- TDARCOS@MCIMAIL.COM
- These opinions are mine alone
-
-