Patent ID: 8947211
Filing Date: 2015-02-03
Classification: H04L

Abstract:
1. A communication data protection method using a Radio Frequency Identification (RFID) reader, the method comprising: receiving, from a tag, a security response message comprising tag information including security parameter information, protocol control bits, a cyclic redundancy check and an Unique Item Identifier, the protocol control bits, cyclic redundancy check and the unique item identifier encrypted by a One Time Pad using a One Time Pad value generated by a symmetric key-based encryption algorithm; extracting a security key value from the security parameter information; extracting the protocol control bits, cyclic redundancy check and the unique item identifier by decrypting the tag information using the security key value in the symmetric key-based encryption algorithm; transmitting, to the tag, a request message including a challenge value for replay prevention; and performing a tag authentication by receiving, from the tag, a response message including a handle and the challenge value, wherein the One Time Pad value is successively selected not to be overlapped among a plurality of One Time Pad values generated according to an Output Feedback (OFB) operation mode of the symmetric key-based encryption algorithm, and all messages transceived between the reader and the tag after the security response message is received are encrypted and transmitted.