HID Global Corporation 5553 Manuale Utente
1508-USM-00-0-04
HF Multi ISO RFID Reader User Manual, Firmware V1.4
5.1.5 MIFARE DESFire
This tag supports additional security algorithms (DES, Triple-DES, MAC) for security sensitive
applications.
applications.
5.1.5.1
Memory organization
The memory of a DESFire card can be personalized to specific requirements. The card can be seen
as data storage device like a hard disk in a PC. The memory is divided into a maximum of 28
different applications (directories) with 16 files each. An application has up to 14 keys. Depending
on keys and access conditions a file can be accessed in four different ways. Plain data is never
secured. Data is secured using a MAC, single DES or triple DES enciphers.
as data storage device like a hard disk in a PC. The memory is divided into a maximum of 28
different applications (directories) with 16 files each. An application has up to 14 keys. Depending
on keys and access conditions a file can be accessed in four different ways. Plain data is never
secured. Data is secured using a MAC, single DES or triple DES enciphers.
The following figure describes the memory organization of a DESFire card.
File
ID 2
Application 1
File
ID 1
...
File
ID n
File
ID 2
Application 2
File
ID 1
...
File
ID n
File
ID 2
Application n
File
ID 1
...
File
ID n
...
DESFire card (Application 0)
Figure 11 - DESFire Memory
Page 112 of 144
August 2010
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