User's Manual

HF Mifare Easy Module V1.0

ACG Identification Technologies GmbH 16

5.6.2 State diagram of DESFire

Figure 5-7: DESFire State diagram

5.6.2.1 Activate PICC

Prior to any access to a DESFire card the card must be selected. A DESFire card

has 7 bytes UID. After activation the card is powered up and ready to accept a

DESFire command. Application 0 is selected automatically.

5.6.2.2 Select application with ID

To jump into another application it has to be selected. An application can be seen as

a directory, which contains up to 16 files. The size of the application depends on the

stored files.

5.6.2.3 Login to application

Each application can be set to specific access rights. A login to an application allows

changing the application organization. Login to a file opens a secured file for access.

A file can be accessed in four different ways: plain with no security, secured with

MAC, single DES or triple DES.

Activate DESFire card

Select file

Change file

Select application

with ID

Commit / Abort

transaction