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Credit card numbers

To: [email protected]
Subject: Credit card numbers
From: Jens Thiel <[email protected]>
Date: Tue, 20 Feb 1996 23:47:15 +0100
Cc: [email protected]
Organization: University of Bonn, Germany
Sender: [email protected]

Is there something like a checksum attached to Credit Card
Numbers. Or better: Is there a way to determine for a given
number N if
  -this _might_ be a valid number
  -this can't be a valid number

Thanx,
Jens.
-- 
mailto:[email protected]
Fax: +49 228 747246
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