The Dutch government has issued a warning this year about the security of access keys that are based on the widely used Mifare Classic RFID chip.

Government institutions plan to take "additional security measures to safeguard security, " Guusje ter Horst, minister of interior affairs, wrote in a letter to parliament on Wednesday.

A number of credit card companies now issue credit cards with embedded RFIDs (radio frequency ID tags), with promises of enhanced "security" and speedy transactions.London (Oyster Card), barclaycard and some American Express cards form USA.

Check out this video to see how to hack RFIDs card with hardware for just 8 bucks.