[M2inOR]

Here is something that may shed some light on cloned cards.

Thereay be two sets of ID numbers. One unclonable, and the other programmable.

A Tag ID (TID) and a separate serial number.

This would use the tag ID (TID) in the transponder along with the serial number. Each RFID chip has a unique serial number that cannot be changed, which identifies the chip as unique. A serial number is then written to the tag's memory. You could read the TID and serial number and make sure there was a correct match, in order to ensure the tag was not cloned.

Imagine true security badges, credit cards, and other IDs in use today for access or spending.