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Amex cards extra four digits



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Oops, following up my own posting, it proves I
should have been more careful...

I wrote
  Wow, you learn something every day. I've never in
  my whole life (well, my American Express life,
  over 15 years) noticed those four digits. I've
  never been asked for them by anyone, or noticed
  them being written down, either. Exactly when and
  how are they used?

But when I reread it I thought it sounded
sarcastic. It isn't -- there really are an extra
four digits printed on both my Amex cards that I'd
never noticed before -- and my question is
serious.

Greg.

Greg Rose               INTERNET: [email protected]  
Sterling Software       VOICE:  +61-2-9975 4777    FAX:  +61-2-9975 2921
28 Rodborough Rd.       http://www.sydney.sterling.com:8080/~ggr
French's Forest         35 0A 79 7D 5E 21 8D 47  E3 53 75 66 AC FB D9 45
NSW 2086 Australia.     co-mod sci.crypt.research, USENIX Director.

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