Tham khảo tài liệu 'development and implementation of rfid technology part 17', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Shared Tag RFID System for Multiple Application Objects 471 Experimental results We have simulated the proposed scheme and made experimental results about efficiency and stability for the scheme. To evaluate efficiency of the scheme we have measured the computation time to perform one session in the proposed authentication procedures. One session means the stage to process the communication from server to tag via reader. To evaluate stability of the scheme we have analyzed average error rates occurred during the authentication procedure. The experimental results were made under the environment as the reader of MHz band the tag with 2 Kbits of read write memory and the communication standard of ISO15693. The experimental results are shown in Fig. 5. basic low level high level procedure procedure procedure a b Fig. 5. Evaluation of the proposed scheme a computation time and b error rate Fig. 5 a shows the comparison results of computation time values for three procedures low level procedure high level procedure and basic procedure of non-security level procedure in common RFID system. The values have been measured by 200 times repeatedly for different tags in the same condition. As shown in Fig. 5 a the value of high level procedure is the largest in three cases but does not exceed double value of the basic procedure and the value of low level procedure is little more than the value of basic procedure. It means that the proposed scheme has reasonable computation time in spite of its strong security. In addition we note that our scheme can save computation time of authentication procedure by using security levels because the scheme applies low level procedure to objects with low security level in multiple object tag. Fig. 5 b shows the comparison results of average error rates for the above three procedures. As the result all of the cases have similar error rates. The results show that the proposed multiple objects-based RFID system can be applied to areas .
