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On 2/2/2015 7:48 PM, David Lang wrote: > I also wonder if they started getting worried about number > exhaustion. I'm sure that when they started that they thought that > 10 or so digits was enough to last forever, but unless they re-use > numbers (at which point they now have much more interesting > recordkeeping about who had what card number when), a different > number for each purchase by a large number of people will run > through numbers rather quickly. Keep in mind that the card-issuers already add an additional 3-4 digits of entropy into that equation via the CVV. And while the merchant isn't keeping track of that you can bet your sweet bippy the card-issuer is. And they know that they can reissue 4123-4567-8901-2345/CVV444 to a new cardholder, years from now, as 4123-4567-8901-2345/CVV555. - -- I prefer to use encrypted mail. My public key fingerprint is FD6A 6990 F035 DE9E 3713 B4F1 661B 3AD6 D82A BBD0. You can download it at http://www.megacity.org/gpg_dballing.txt Learn how to encrypt your email with the E-Mail Self Defense Guide: https://emailselfdefense.fsf.org/en/ -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0 Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJU0CFTAAoJEGYbOtbYKrvQC9gP/RAJr9N1nhmbgTCyIGjepBNU y6zSOWuof49H8IG0947PqcNPNIWZZpl5Twi0CrroX47VV2ed6Kt6W7SHlwEM/dI8 xj8d3VT/0kxKOSfNMCMqeuisddaSHq2Rp11WP881J/Fcik2iE4oSgCK1Cbf7Pkfm WEeIrfSj6KXSFjRNP4EIhB3v830BcViYlkwQtcHgTgIfHkA3VIMZiDcML/J/NVwf 3AoSHnUmGjqpvv5CCUPvNvBxzSnIbs/lAwxQWTpO5AzyoPE9K5QAxqkEDi5CIlxB Og8uHy9ROz6hXbAj6NriB1BzLTaimUkltRVemoab7jqKeNhbSuHojNxw3N85/HxT /pHwntLdMA4xsLK4iMtKo6r+PvLCDQVApgwS1/SQcETGuzQRKbAyJ6SihIqco9iK dOoV39LFAbrq4DYhkp9UXIfgy2sQmxXHICeno3NHM4dcDFJFI9Il82GSKPjUMgN5 PgLok0DKgs/CCMzTfFM/Di6trhmFRLlgq5JzHGkDkrxdvUaCdAYRraEJn6ZTV1BE AoHna5uvU+fgARx1MZNdP4OavolVCnp9DU2SXmXnSq0sX1mXrng5kKIkYVvaEUG/ LhVaMkBymwRVDlVXf1nH4qOYFPd+a3rEOXASRRv6VPD+BbEq7L58HNbtb65IrTwB 9n86tkK11DUjdLBqHM5q =ZXR/ -----END PGP SIGNATURE----- _______________________________________________ Discuss mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/discuss This list provided by the League of Professional System Administrators http://lopsa.org/
