A CHALLENGED-BASED TAG AUTHENTICATION MODEL

摘要

A method of securing communications in an RFID system (30) including a reader (32) and an RF tag (44) having a memory (50) configured to store information comprises sending, from the reader (32), a message to the tag (44); the tag (44), in response to the message, generating a challenge value and sending the challenge value to the reader (32); in any order: the reader (32) performing a mathematical operation on the challenge value based upon a key value (66, 68) to generate a challenge reply and sending the challenge reply to the tag (44) and the tag (44) independently computing a challenge response based on the key value (66, 68) and mathematical operation; the tag (44) comparing the challenge response computed by the tag (44) with the challenge reply sent by the reader (32); and the tag (44) authenticating the reader (32) if the challenge response matches the challenge reply. An RFID system (30) including an RFID tag (44) and a reader (32) are configured to perform the above steps.