Introduction - If you have any usage issues, please Google them yourself
		 
 
In this paper, we first propose a cryptographic 
authentication protocol which meets the privacy 
protection for tag bearers, and then a digital Codec for 
RFID tag is designed based on the protocol. The 
protocol which uses cryptographic hash algorithm is 
based on a three-way challenge response 
authentication scheme. 
In addition, we will show how the three different 
types of protocol frame formats are formed by 
extending the ISO/IEC 18000-3 standard[3] for 
implementing the proposed authentication protocol in 
RFID system environment. The system has been 
described in Verilog HDL and also synthesized using 
Synopsys Design Compiler with Hynix 0.25 µ m 
standard-cell library. From implementation results, we 
found that the proposed scheme is well suite to 
implement robust RFID system against active attacks 
such as the man-in-the-middle attack.