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:: The CVV2 is an encryption of the card number and expiry date, under a key known only to the issuing bank. The CVV on the magstripe is similar but the encryption also covers the service code, a value on the magnetic stripe. [[User:Zaian|Zaian]] 10:46, 18 June 2006 (UTC)
::: This isn't an encryption, although it may be a hash. The bank can't recover the card number, no matter how many keys they have, from a mere 3 digits! [[User:Andy Dingley|Andy Dingley]] ([[User talk:Andy Dingley|talk]]) 16:52, 10 June 2008 (UTC)
== Security model ==
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