Do you buy online with your credit card (Visa), and you think you're safe? Think again, because it seems much easier for crooks to guess your credentials.
According to a survey by Newcastle University, there is a black hole in credit card security that makes it very easy for hackers to retrieve sensitive information. 
Researchers have discovered that if they try their speculation about the CVC number of the card on many different websites, security systems are not activated and the owner will not be alerted to suspicious activity.
The above video shows that hackers need only six seconds with a specially designed toolbox to reveal the CVC of a card.
https://www.youtube.com/watch?v=uwvjZGKwKvY
By creation data που συλλέγονται από πολλές εικασίες που πραγματοποιούνται σε διαφορετικές ιστοσελίδες-αγορές, το λογισμικό είναι σε θέση να συγκεντρώσει γρήγορα πληροφορίες όπως την date expiry date of the card, the address of the holder or the CVC. The technique is rumored to have been used in a Tesco incident earlier this month.
The researchers report that only Visa cards are susceptible to this particular security flaw, as other card issuers such as MasterCard monitor hackers' attempts to guess information from different websites as well. The ecosystem Visa however, is not set up to track many online purchases.
Before publishing their findings to IEEE Security & Privacy 2017 (PDF), investigators notified Visa, but the company, unfortunately, doesn't seem to have taken their findings seriously, telling The Independent that "the research doesn't take into account the multiple anti-fraud layers that exist within the payment system, each of which must be met in order for any transaction."
Credit cards are a perfect example of the former technology that still exists in a modern world.
