# Testing of Permeability of RFID Access Control System for the Needs of Security Management
## 4 Results  
The test equipment, when modified in 2022, includes a design that can measure the exact distance from the reading device. A combined biometric and RFID access control system with a Crypton x112 reader was selected for card reading. For testing, we used four contactless RFID cards for the RFID reader, code, access control, and biometric systems (125 kHz). The cards can be used both indoors and outdoors as the operating temperature ranges between \(-40\)\({}^{\circ}\)C to \(85\)\({}^{\circ}\)C. The size of the cards is \(86\)\(\times\)\(54\)\(\times\)\(0.8\) mm [43]. The cards were secured to the test equipment using Velcro, which ensures the stability of the card during rotational movement of the test equipment. One side of the Velcro is located on the plastic cylinder in an amount of \(4\) pcs at regular spacing. The other side of the Velcro was glued to all the test cards. The first step was to place the RFID cards on the test roll and the selected RFID reader on the fabricated sliding stand. As these were four identical cards, there was no need to specially line them up on the test roller. The reader was placed at three different distances. These were the maximum card capture distance, the minimum distance, and finally, the average distance. To find the maximum reader placement distance, we used a multiple trial method in which we zoomed the reader on a sliding ruler up to the card capture point. We repeated this process 10 times to be sure of the correctness of the result. By experiment, we found that the limiting distance to which the reader could be placed to capture the cards placed on the cylinder was 10 cm. Subsequently, for each measurement, the reader was placed below the limit distance at three different distances of 8 cm, 4 cm, and 0.5 cm. We performed 1000 repetitions at each distance. We successively placed four, two, and then one card on the test reel, test equipment we can see at Figure 4. For each of the options, we performed 1000 possible reads with  
Figure 3: Graphical representation of pilot tests aimed at testing the reading of RFID cards and tags. the reader. For the four cards, this amounted to turning the plastic cylinder 250 times, for the two cards, 500 times, and for the one card, a total of 1000 times at each of the three distances. The results of the testing are presented in the next section of the paper. Result of testing we can see at Table 2.  
When four cards were placed, the cylinder was rotated at the lowest speed of one cylinder rotation/10 s; thus, one card every 2.5 s. Results we can see at Table 2.  
In the next section, we discussed an experiment in which we placed two cards opposite each other on the test cylinder. By doing so, we created more time space for the reader to capture each card. At the same rotation speed, a single card should be read in about 5 s. Results we can see at Table 3.  
Because there were only two cards on the test device, the reader had a longer time to stabilize and prepare to load the next card. Perhaps this was the reason for the higher read success rate than when using four cards. We subsequently left only one card on the test device. We did not change the rotation speed. Results we can see at Table 4. \begin{table}
\begin{tabular}{l c c c c} \hline \hline  & **Number of** & **Number of** & **Number of** & **Success (\%)** \\  & **Repetitions** & **Retrievals** & **Non-Retrievals** & **Success (\%)** \\ \hline Distance 0.5 cm & 1000 & 932 & 68 & **93.20** \\ \hline Distance 4 cm & 1000 & 977 & 23 & **97.70** \\ \hline Distance 8 cm & 1000 & 906 & 94 & **90.60** \\ \hline Total & **3000** & **2815** & **185** & **93.83** \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Results of card loading reliability testing with four cards placed on the test device. Figure 4: Design of RFID card- and tag-reading test equipment.