It's another way for scam artists to steal your identity. Several law enforcement agencies are warning folks about callers claiming to be from Mastercard or Visa, asking for the security code on your credit card. Lawmen say don't give it out. Martin County officials say if it's a reputable company like Mastercard or Visa, they are already going to know the security information on the back of your card because they are the ones that issued the card. If you’re concerned you’re being scammed, you should contact your local law enforcement and credit card company.