User's Manual

HF Mifare Easy Module V1.0
ACG Identification Technologies GmbH 15
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 own requirements. The card
can be seen as data storage like a hard disk in a PC. The memory is divided in up to
28 different applications (directories) and 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.
Following figure describes the memory organization of a DESFire card.
Figure 5-6: DESFire memory organization
DESFire card (Applica
tion 0)
Application 1
Application 2
File
ID 1
File
ID 2
File
ID 3
File
ID 1
File
ID 3
File
ID 2
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