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How does the server know the CVV2 code that was generated by the Emue card? Or, given the card number, and other variables like time of day, is the CVV2 code d
by aneesh 17y ago
How does the server know the CVV2 code that was generated by the Emue card? Or, given the card number, and other variables like time of day, is the CVV2 code determined by some function?
- ruslan 17y agoYes, it's some polynomial function initialized by pin number value. This is plain old technology which is very well used in corporate banking for years: accountants receive their "beepers" to generate authentication code to authorize their transactions (wire transfers for example).