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ACG HF Multi ISO RFID Reader V1.0 5.6.2 State diagram of DESFire Activate DESFire card Select Application Login to Application Select File with ID Change File Commit / Abort Transaction Figure 5-7: DESFire state diagram ACG Identification Technologies GmbH 23
ACG HF Multi ISO RFID Reader V1.0 5.6.2.1 Activate PICC Before accessing a DESFire card, the card must be selected. A DESFire card has a 7 byte 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 To jump into another application, the application 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 Specific access rights can be set for each application. Login to an application allows changing the organization of the application. Login to a file opens a secured file for access. A file can be accessed in four different ways: without any security or secured with MAC, single DES or triple DES. 5.6.2.4 Select file Before accessing a file, the file must be selected 5.6.2.5 Change file A selected file can be changed according its access rights. If a file is secured, a login is required before changes can be made. 5.6.2.6 Commit / Abort transaction Value files, backup files, linear record files and cyclic record files only adapt their values after the commit transaction command is given. Several files can be changed within an application at the same time. The abort transactions command annuls all changes within an application. Power loss will cancel all modifications too. For more details about application settings and access rights refer to [2]. ACG Identification Technologies GmbH 24
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