One CVV variant, now commonly called CVV2 (Visa), or Indent CVC (Master Card), uses ‘000’ as the service code parameter to the CVV algorithm.Sometimes a card will have both a traditional CVV and a CVV2.Another variation to the CVV algorithm can be introduced by changing the format of the expiration date.
For instance, Visa CVV2s are usually calculated using the YYMM format.
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Besides the obvious CVV variations provided by different PANs and expiration dates, most card issuers will use different CVKs for different batches of cards.
Cards can be grouped by bank, by ATM network, or by other means of identifying a certain group of cards.
Cards in the same batch will often use the same service code.This service code to the CVV algorithmis usually non-zero.Posted in Credit card at by graham CVVs, CVV2s, CVCs, and Indent CVCs are 3-digit Card Verification Values or Card Verification Codes that are all calculated using the same CVV algorithm.These values are required by payment systems such as Visa and Master Card to authenticate their credit or debit cards.Different names are used to refer to the values depending on the particular payment system, the location of the value on the card, and the parameters passed to the CVV algorithm.To calculate a 3-digit CVV, the CVV algorithm requires a Primary Account Number (PAN), a 4-digit Expiration Date, a 3-digit Service Code, and a pair of DES keys (CVKs).