Patent ID: 8446260
Filing Date: 2013-05-21
Classification: G06K

Abstract:
1. A group proving method applied to a plurality of radio frequency identification (RFID) tags to perform a group proving operation together with a RFID reader, the group proving method comprising the steps of: generating a random number parameter in response to a first round parameter provided by the RFID reader, wherein the first round parameter relates to tag identification data of each of the RFID tags; generating a first response parameter according to the first round parameter, the random number parameter and a tag key; determining whether each of the RFID tags receives a second round parameter provided by the RFID reader in a predetermined period after an initial time point of receiving the first round parameter, wherein the second round parameter relates to the first response parameter of the RFID tags; determining whether the first and second round parameters correspond to each other; updating the tag key according to the random number parameter when the first and second round parameters correspond to each other and the second round parameter is received in the predetermined period after the initial time point; and generating and outputting a second response parameter according to the second round parameter, the random number parameter and the updated tag key; calculating a first operation parameter according to the first round parameter and the random number parameter; and encrypting the first operation parameter to generate the first response parameter according to the tag key; calculating a second operation parameter according to the second round parameter and the random number parameter; and encrypting the second operation parameter to generate and output the second response parameter according to the updated tag key.