Radio frequency label identification

In the include tag reader (101) and labels (102) RFID identification systems, unique and confidential identifier (x,y,x ′, y ′) associated with each label, sent from the label (401) the first random number (BI) described to readers. And then sent from the reader is referred (402) the second random number (AI) to the label described. The RFID tag, the tag value is encrypted through will have a third and fourth random number based on probabilistic rules (VI,VI ′), according to determine the function f (BI), f (AI) converted the first and second random numbers, as well as the identifier and the first and second random numbers, and the number of conversions, and the first and second and combined third and fourth random number to obtain. To send an encrypted identifier is the value of a reader (403,404). N times repeat after processing, the reader of the RFID tags as received the encrypted identifier for functions, n n, a value that determines the first and second random numbers and probability rules and probability functions, the RFID tag is recognized.