[43457] in Cypherpunks
Re: credit card conventional wisdom (fwd)
daemon@ATHENA.MIT.EDU (Greg ROSE)
Wed Nov 15 21:48:24 1995
From: Greg_Rose@sibelius.sydney.sterling.com (Greg ROSE)
To: Simon Spero <ses@tipper.oit.unc.edu>
Cc: cypherpunks@toad.com
In-Reply-To: Your message of Wed, 15 Nov 95 18:22:44 PST.
<Pine.SOL.3.91.951115182044.18955B-100000@chivalry>
Date: Thu, 16 Nov 95 13:42:58 +1000
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The printed digits above the embossed account number are the first four
digits of the BIN (on Visa cards) or ICA (on MasterCards). They are there
to discourage re-embossing of the card with another account number.
True for Visa cards, but false for the AMEX. On my
two Amex cards there is no obvious relationship
between the four digit number and the embossed
card number.
Greg.
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