Talk:Cryptogram

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Printed receipts from e.g. Waitrose (British supermarket) include a something labelled "cryptogram" which is a sequence of letters and numbers. It's clearly not a puzzle but perhaps some kind of credit card validation hash; does anybody have any ideas? 86.153.9.80 (talk) 17:26, 26 January 2008 (UTC)

[edit] Hi

Cryptograms are hard done —Preceding unsigned comment added by 67.188.54.218 (talk) 03:28, 13 February 2008 (UTC)