The card security code is located on the back of Visa, MasterCard, Diners Club, Discover, and JCB debit or credit cards and is typically a separate group of 3 digits to the right of the signature strip.
CVVs, CVV2s called card verification data, card verification number, card verification value, card security code (CSC), are 3-digit Card Verification Values that are all calculated using the same CVV algorithm, for "card not present" payment card transactions instituted to reduce the incidence of credit card fraud.
The codes have different names:
The are required by payment systems such as MasterCard and Visa to authenticate their credit or debit cards.
There are several types of security codes: The first code is encoded on track 2 of the magnetic stripe of the card and used for card present transactions called CVC1 or CVV1, The second code is often sought by merchants for card occurring by fax, mail, or Internet telephone, it is called CVV2 or CVC2. The card security code is typically the last three or four digits printed.
To generate or calculate the 3-digit CVV is required a Primary Account Number (PAN), It is a 4-digit Expiration Date, a pair of DES keys (CVKs), and a 3-digit Service Code.
The CVV number genertor will gives three-digit number, it is a fake CVV number couldn't be uesed in real life.