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. 
The researchers found that if they tested their guesses about the card's CVC number on several different websites, the security systems are not activated and the owner will not be notified of the 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 δεδομένων που συλλέγονται από πολλές εικασίες που πραγματοποιούνται σε διαφορετικές ιστοσελίδες-αγορές, το λογισμικό είναι σε θέση να συγκεντρώσει γρήγορα πληροφορίες όπως την ημερομηνία λήξης της κάρτας, τη διεύθυνση του κατόχου ή και το CVC. Η technique it is rumored to have been used in a Tesco incident earlier this month.
Researchers report that only Visa cards are vulnerable to the specific security flaw, as other card issuers such as MasterCard track the hacker's attempts to guess items from different websites. The Visa ecosystem, however, is not set to watch many online shopping.
Before publishing their findings to IEEE Security & Privacy 2017 (PDF), the researchers informed Visa, but the company, unfortunately, does not seem to have taken their findings seriously, telling The Independent that “the research does not take into account, the multiple layers of combating scams that exist within the payment system, each of which you must meet in order for a transaction to take place.”
The credit cards it is a perfect example of old technology still existing in a modern world.
