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From: roz@l.cc.purdue.edu (Vu Qui Hao-Nhien)
Newsgroups: sci.crypt
Subject: Re: ATM secret codes
Message-ID: <548@l.cc.purdue.edu>
Date: Tue, 7-Jul-87 16:53:31 EDT
Article-I.D.: l.548
Posted: Tue Jul  7 16:53:31 1987
Date-Received: Sat, 11-Jul-87 01:46:13 EDT
References: <-63293659@sneaky> <192@sugar.UUCP> <127@ddsw1.UUCP>
Reply-To: roz@l.cc.purdue.edu.UUCP (Vu Qui Hao-Nhien)
Organization: Purdue U. Dept. of Mathematics
Lines: 24

In article <127@ddsw1.UUCP> karl@ddsw1.UUCP (Karl Denninger) writes:
>In article <192@sugar.UUCP>, karl@sugar.UUCP (Karl Lehenbauer) writes:
>> Most ATMs will keep your card after three or four failed attempts to
>> enter a number.  

...(Here, a story about card eaten up by machine of a different bank)...

>Moral: It won't work unless the banks are incredibly stupid where you are;
>the 'eat' function is controlled by the home bank of the card, not the ATM!

The 'eat' function is controlled by the card itself.  The info about the
number of times the code was entered wrong is written on the magnetic strip,
and so it doesn't matter when and where is the last time you used the card,
it's on there.

The transactions done by ATM sometimes (not always) are kept by the
machine until remove by human hands and fed to the bank's computer at
its headquarters.  Hence not much communication between ATM and the
outside world.
-- 
"I tawt I taw a tootty tat"
Hao-Nhien Q. Vu (pur-ee!l.cc.purdue.edu!vu)
                (vu@l.cc.purdue.edu)
                [That's "ell", not "one"]