ACG HF Multi ISO RFID Reader - RFID Webshop
ACG HF Multi ISO RFID Reader - RFID Webshop
ACG HF Multi ISO RFID Reader - RFID Webshop
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<strong>ACG</strong> <strong>HF</strong> <strong>Multi</strong> <strong>ISO</strong> <strong>RFID</strong> <strong>Reader</strong> V1.0<br />
5.6 Mifare DESFire<br />
This tag supports additional security algorithms (DES, Triple-DES, MAC) for security<br />
sensitive applications.<br />
DESFire tags are addressed using a specific command set (see DESFire command<br />
set).<br />
5.6.1 Memory organization<br />
The memory of a DESFire card can be personalized to specific requirements. The<br />
card can be seen as data storage device like a hard disk in a PC. The memory is<br />
divided into a maximum of 28 different applications (directories) with 16 files each. An<br />
application has up to 14 keys. Depending on keys and access conditions a file can<br />
be accessed in four different ways. Plain data is never secured. Data is secured<br />
using a MAC, single DES or triple DES enciphers.<br />
The following figure describes the memory organization of a DESFire card.<br />
DESFire card (Application 0)<br />
Application 1 Application 2<br />
File<br />
ID 1<br />
File<br />
ID 2<br />
File<br />
ID 1<br />
File<br />
ID 2<br />
File<br />
ID 3<br />
File<br />
ID 3<br />
Figure 5-6: DESFire memory organization<br />
<strong>ACG</strong> Identification Technologies GmbH 22