-----BEGIN PGP SIGNED MESSAGE----- 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: greg_rose@sydney.sterling.com 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. -----BEGIN PGP SIGNATURE----- Version: 2.6.2i iQCVAwUBMKqhTaRQkCwJ0+ZNAQGchQQAsmID1hHpIxJzjeXpkrrNxW4IWVoQwyel 2xb5VAoam37CPLj7ic5M+TqRh+FTBEwWItr3Uv18isv3+dYC7fKCvE7YCMBvENeO xHzuNqoPiHCUnBUbFRP4U8/RO/GGdiPOo6ZlOnzOOmdzD2yDsWfPx6t6x0bVsFN+ 63G/e6EgXzs= =Xzwz -----END PGP SIGNATURE-----