User's Manual

ACGPass e-ID Desktop Reader, Ver. Dual ISO 2.3
5.6 mifare
®
DESFire
This tag supports additional security algorithms (DES, Triple-DES, MAC) for security
sensitive applications.
DESFire tags are addressed using a specific command set (see DESFire command
set).
5.6.1 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.
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 5-6: DESFire memory organization
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