New research into the security of Visa credit and debit cards has described the ability to bypass online payment security methods in just six seconds as frighteningly easy The technique, known as a Distributed Guessing Attack, was used in the recent 2.5million hack on the 20,000 customers of Tesco. The only way to secure payment systems against distributed guessing attacks are to centralize as Mastercard has done or standardize, with all sites requiring the same information to validate card numbers.”]
Source: https://gbhackers.com/visa-card-distributed-guessing-attack-just-6-seconds-verify-visa-card-details/