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+# Desfire card
+
+## Documentation
+[Desfire Light datasheet MF2DLHX0](https://www.nxp.com/docs/en/data-sheet/MF2DLHX0.pdf)
+[Features and Hints AN12343](https://www.nxp.com/docs/en/application-note/AN12343.pdf)
+[Quick Start Guide AN12341](https://www.nxp.com/docs/en/application-note/AN12341.pdf)
+[LRP Specification](https://www.nxp.com/docs/en/application-note/AN12304.pdf)
+[NTAG 424 DNA NT4H2421Gx](https://www.nxp.com/docs/en/data-sheet/NT4H2421Gx.pdf)
+[NTAG features and hints - LRP mode](https://www.nxp.com/docs/en/application-note/AN12321.pdf)
+[ev2 samples AN12196](https://www.nxp.com/docs/en/application-note/AN12196.pdf)
+[MIFARE Application Directory AN10787](https://www.nxp.com/docs/en/application-note/AN10787.pdf)
+[Symmetric key diversifications AN10922](https://www.nxp.com/docs/en/application-note/AN10922.pdf)
+
+## Source code
+[desfire_crypto from proxmark3](https://github.com/RfidResearchGroup/proxmark3/blob/master/armsrc/desfire_crypto.c)
+[libfreefare](https://github.com/nfc-tools/libfreefare)
+[desfire-tools-for-android](https://github.com/skjolber/desfire-tools-for-android)
+[nfcjlib](https://github.com/andrade/nfcjlib/)
+[java-card-desfire-emulation](https://github.com/gathigai/java-card-desfire-emulation)
+[ChameleonMiniDESFireStack](https://github.com/maxieds/ChameleonMiniDESFireStack/)
+[LRP/ev2 nfc-ev2-crypto](https://github.com/icedevml/nfc-ev2-crypto)
+
+## Communication channel with a card:
+The card can work in the combination of: key type - command set - secure channel - communication mode
+
+*key types*
+**des** - 8 bytes key. can be present in a form of **2tdea** key with length 16 bytes by duplicate contents twice.
+**2tdea** - 16 bytes key
+**3tdea** - 24 bytes key. can be disabled on the card level.
+**aes** - 16 bytes aes-128 key
+
+*command sets:*
+**native** - raw commands
+**native iso** - wrap raw commands into the iso apdu. **CLA** = 0x90, **INS** = command code, **data** = the rest data from raw command
+**iso** - work only several commands: iso select by iso id (if enabled), authenticate, read and write in the **plain** mode, read in the **mac** mode
+
+*secure channels:*
+**d40** - old secure channel that can work only with **des** and **2tdea** keys
+**ev1** - secure channel that can work with all the keys: **des**, **2tdea**, **3tdea**, **aes**
+**ev2** - the newest channel that can work with **aes** key only
+
+*communication modes* 
+**plain** - just plain data between card and reader
+**maced** - mac applied to reqest/response/both (may be sent and may be not)
+**encrypted** - encrypted data in the reqest/response/both. in the ev2 channel data signed with mac.
+
+## Card architecture
+
+Card has several applications on it and the application have files and some other objects
+Each card has a master application with AID 0x000000 that saves card's configuration.
+Master application has many keys with different purposes, but commands show that there is only one key - card master key.
+Each application may have its own key type and set of keys. Each file can only have links to these keys in its access rights.
+
+## Card structure:
+
+- Application
+- Application number: 1 byte
+- Application ISO number: if set at the time of application creation. It can be selected by this id in the iso command set.
+- Application DF name: 1-16 chars. It can be selected by this name in the iso command set.
+- Key settings: number of keys, key type, key config (what can do/not user with keys)
+- Keys: up to 14 keys (indexes 0..d)
+- Key versions: key version of corresponded key
+- Files:
+  - File number: 1 byte
+  - File iso number: should be if application created with iso number and should not be if there is no iso number at the application level.
+  - File type: standard, backup, value, cyclic record, linear record, transaction mac
+  - Some settings that belonged to file type (size for standard file at sample)
+  - File communication mode: plain/maced/encrypted
+  - File access right: there is 4 modes: read/write/read-write/change settings. And each mode access can be: key0..keyD, E - free access, F - deny access
+
+## How to
+
+### How to get card UID
+The card can return UID in encrypted communication mode. Needs to authenticate with any key from the card.
+`hf mfdes getuid` - authenticate with default key
+`hf mfdes getuid -s d40` - via d40 secure channel
+`hf mfdes getuid -s ev2 -t aes -k 11223344556677889900112233445566` - via ev2 secure channel with specified aes key
+
+### How to get/set default communication channel settings
+All the commands use these settings by default if a more important setting is not specified in the command line.
+`hf mfdes default` - get channel settings
+`hf mfdes default -n 1 -t aes` - set key number 1 and key type aes
+
+### How to guess default communication channel settings
+`hf mfdes detect` - simply detect key for master application (PICC level)
+`hf mfdes detect --save` - detect key and save to defaults. look after to output of `hf mfdes default`
+`hf mfdes detect -s d40` - detect via channel d40
+`hf mfdes detect --dict mfdes_default_keys` - detect key with help of dictionary file
+`hf mfdes detect --aid 123456 -n 2` - detect key 2 from application with AID 123456
+
+### How to try communication channel settings
+`hf mfdes auth -n 0 -t des -k 1122334455667788 --aid 123456` - try application 123456 master key 
+`hf mfdes auth -n 0 -t aes --save` - try PICC AES master key and save the configuration to defaults if authentication succeeds
+
+### How to look at the application list on the card
+`hf mfdes lsapp --no-auth` - show applications list without authentication
+`hf mfdes lsapp` - show applications list with authentication from default settings
+`hf mfdes lsapp --files` - show applications list their files