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Notes on Magic Cards, aka UID changeable

This document is based mostly on information posted on http://www.proxmark.org/forum/viewtopic.php?pid=35372#p35372

Useful docs:

Table of Contents

ISO14443A

Identifying broken ISO14443A magic

^Top

When a magic card configuration is really messed up and the card is not labeled, it may be hard to find out which type of card it is.

Here are some tips if the card doesn't react or gives error on a simple hf 14a reader:

Let's force a 4b UID anticollision and see what happens:

hf 14a config --atqa force --bcc ignore --cl2 skip --rats skip
hf 14a reader

It it responds, we know it's a TypeA card. But maybe it's a 7b UID, so let's force a 7b UID anticollision:

hf 14a config --atqa force --bcc ignore --cl2 force --cl3 skip --rats skip
hf 14a reader

At this stage, you know if it's a TypeA 4b or 7b card and you can check further on this page how to reconfigure different types of cards.

To restore anticollision config of the Proxmark3:

hf 14a config --std

MIFARE Classic

^Top

Referred as M1, S50 (1k), S70 (4k)

MIFARE Classic block0

^Top

UID 4b: (actually NUID as there are no more "unique" IDs on 4b)

11223344440804006263646566676869
^^^^^^^^                         UID
        ^^                       BCC
          ^^                     SAK(*)
            ^^^^                 ATQA
                ^^^^^^^^^^^^^^^^ Manufacturer data
(*) some cards have a different SAK in their anticollision and in block0: +0x80 in the block0 (e.g. 08->88, 18->98)

Computing BCC on UID 11223344: hf analyse lcr -d 11223344 = 44

UID 7b:

04112233445566884400c82000000000
^^                               Manufacturer byte
^^^^^^^^^^^^^^                   UID
              ^^                 SAK(*)
                ^^^^             ATQA
                    ^^^^^^^^^^^^ Manufacturer data
(*) all? cards have a different SAK in their anticollision and in block0: +0x80 in the block0 (e.g. 08->88, 18->98)

MIFARE Classic Gen1A aka UID

^Top

Identify

^Top

hf 14a info
...
[+] Magic capabilities : Gen 1a

Magic commands

^Top

  • Wipe: 40(7), 41 (use 2000ms timeout)
  • Read: 40(7), 43, 30xx+crc
  • Write: 40(7), 43, A0xx+crc, xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx+crc

Characteristics

^Top

  • UID: Only 4b versions
  • ATQA:
    • all cards play blindly the block0 ATQA bytes, beware!
  • SAK:
    • some cards play blindly the block0 SAK byte, beware!
    • some cards use a fix "08" in anticollision, no matter the block0
    • some cards use a fix "08" in anticollision, unless SAK in block0 has most significant bit "80" set, in which case SAK="88"
  • BCC:
    • all cards play blindly the block0 BCC byte, beware!
  • ATS:
    • no card with ATS

MIFARE Classic Gen1A flavour 1

^Top

  • SAK: play blindly the block0 SAK byte, beware!
  • PRNG: static 01200145
  • Wipe: filled with 0xFF

MIFARE Classic Gen1A flavour 2

^Top

  • SAK: play blindly the block0 SAK byte, beware!
  • PRNG: static 01200145
  • Wipe: filled with 0x00

MIFARE Classic Gen1A flavour 3

^Top

  • SAK: 08
  • PRNG: static 01200145
  • Wipe: filled with 0xFF

MIFARE Classic Gen1A flavour 4

^Top

  • SAK: 08
  • PRNG: weak
  • Wipe: timeout, no wipe

MIFARE Classic Gen1A flavour 5

^Top

  • SAK: 08
  • PRNG: weak
  • Wipe: reply ok but no wipe performed

MIFARE Classic Gen1A flavour 6

^Top

  • SAK: 08 or 88 if block0_SAK most significant bit is set
  • PRNG: weak
  • Wipe: timeout, no wipe

MIFARE Classic Gen1A flavour 7

^Top

  • SAK: 08 or 88 if block0_SAK most significant bit is set
  • PRNG: weak
  • Wipe: filled with 0x00

Proxmark3 commands

^Top

hf mf csetuid
hf mf cwipe
hf mf csetblk
hf mf cgetblk
hf mf cgetsc
hf mf cload 
hf mf csave
hf mf cview

When "soft-bricked" (by writing invalid data in block0), these ones may help:

# MFC Gen1A 1k:
hf mf cwipe -u 11223344 -a 0004 -s 08
# MFC Gen1A 4k:
hf mf cwipe -u 11223344 -a 0044 -s 18

or just fixing block0:

# MFC Gen1A 1k:
hf mf csetuid -u 11223344 -a 0004 -s 08
# MFC Gen1A 4k:
hf mf csetuid -u 11223344 -a 0044 -s 18

script run hf_mf_magicrevive

To execute commands manually:

hf 14a raw -a -k -b 7       40
hf 14a raw    -k            43
hf 14a raw    -k -c         A000
hf 14a raw       -c -t 1000 11223344440804006263646566676869

wipe:

hf 14a raw -a -k -b 7       40
hf 14a raw -t 1000          41

libnfc commands

^Top

nfc-mfsetuid
nfc-mfclassic R a u mydump
nfc-mfclassic W a u mydump

MIFARE Classic Gen1B

^Top

Similar to Gen1A, but supports directly read/write after command 40

Identify

^Top

hf 14a info
...
[+] Magic capabilities : Gen 1b

Magic commands

^Top

  • Read: 40(7), 30xx
  • Write: 40(7), A0xx+crc, xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx+crc

MIFARE Classic DirectWrite aka Gen2 aka CUID

^Top

(also referred as MCT compatible by some sellers)

Identify

^Top

hf 14a info
...
[+] Magic capabilities : Gen 2 / CUID

Not all Gen2 cards can be identified with hf 14a info, only those replying to RATS.

To identify the other ones, you've to try to write to block0 and see if it works...

Magic commands

^Top

Android compatible

  • issue regular write to block0

Characteristics

^Top

  • UID: 4b and 7b versions
  • ATQA:
    • some cards play blindly the block0 ATQA bytes, beware!
    • some cards use a fix ATQA in anticollision, no matter the block0. Including all 7b.
  • SAK:
    • some cards play blindly the block0 SAK byte, beware!
    • some cards use a fix "08" or "18" in anticollision, no matter the block0. Including all 7b.
  • BCC:
    • some cards play blindly the block0 BCC byte, beware!
    • some cards compute a proper BCC in anticollision. Including all 7b computing their BCC0 and BCC1.
  • ATS:
    • some cards don't reply to RATS
    • some reply with an ATS

MIFARE Classic DirectWrite flavour 1

^Top

  • UID 4b
  • ATQA: play blindly the block0 ATQA bytes, beware!
  • SAK: play blindly the block0 SAK byte, beware!
  • BCC: play blindly the block0 BCC byte, beware!
  • ATS: no
  • PRNG: weak

MIFARE Classic DirectWrite flavour 2

^Top

  • UID 4b
  • ATQA: fixed
  • SAK: fixed
  • BCC: computed
  • ATS: 0978009102DABC1910F005
  • PRNG: weak

MIFARE Classic DirectWrite flavour 3

^Top

  • UID 4b
  • ATQA: play blindly the block0 ATQA bytes, beware!
  • SAK: fixed
  • BCC: play blindly the block0 BCC byte, beware!
  • ATS: no
  • PRNG: weak

MIFARE Classic DirectWrite flavour 4

^Top

  • UID 7b
  • ATQA: fixed
  • SAK: fixed
  • BCC: computed
  • ATS: 0978009102DABC1910F005
  • PRNG: static 00000000

MIFARE Classic DirectWrite flavour 5

^Top

  • UID 4b
  • ATQA: fixed
  • SAK: play blindly the block0 SAK byte, beware!
  • BCC: computed
  • ATS: no
  • PRNG: weak

MIFARE Classic DirectWrite flavour 6

^Top

TODO need more info

  • UID 7b
  • ATS: 0D780071028849A13020150608563D

Proxmark3 commands

^Top

hf mf wrbl --blk 0 -k FFFFFFFFFFFF -d 11223344440804006263646566676869

hf mf wipe --gen2

When "soft-bricked" (by writing invalid data in block0), these ones may help:

hf 14a config -h

e.g. for 4b UID:

hf 14a config --atqa force --bcc ignore --cl2 skip --rats skip
hf mf wrbl --blk 0 -k FFFFFFFFFFFF -d 11223344440804006263646566676869 # for 1k
hf mf wrbl --blk 0 -k FFFFFFFFFFFF -d 11223344441802006263646566676869 # for 4k
hf 14a config --std
hf 14a reader

e.g. for 7b UID:

hf 14a config --atqa force --bcc ignore --cl2 force --cl3 skip --rats skip
hf mf wrbl --blk 0 -k FFFFFFFFFFFF -d 04112233445566084400626364656667 # for 1k
hf mf wrbl --blk 0 -k FFFFFFFFFFFF -d 04112233445566184200626364656667 # for 4k
hf 14a config --std
hf 14a reader

MIFARE Classic DirectWrite, FUID version aka 1-write

^Top

Same as MIFARE Classic DirectWrite, but block0 can be written only once.

Initial UID is AA55C396

Identify

^Top

Only possible before personalization.

hf 14a info
...
[+] Magic capabilities : Write Once / FUID

MIFARE Classic DirectWrite, UFUID version

^Top

Same as MIFARE Classic DirectWrite, but block0 can be locked with special command.

Identify

^Top

TODO

Proxmark3 commands

^Top

To lock definitively block0:

hf 14a raw -a -k -b 7 40
hf 14a raw    -k      43
hf 14a raw    -k -c   e000
hf 14a raw    -k -c   e100
hf 14a raw       -c   85000000000000000000000000000008

MIFARE Classic, other versions

^Top

TODO

  • ZXUID, EUID, ICUID ?
  • Some cards exhibit a specific SAK=28 ??

MIFARE Classic Gen3 aka APDU

^Top

Identify

^Top

hf 14a info
...
[+] Magic capabilities : Gen 3 / APDU

Magic commands

^Top

Android compatible

  • issue special APDUs
cla  ins p1  p2  len
 90  F0  CC  CC  10 <block0>  - write block 0
 90  FB  CC  CC  07 <uid>     - change uid (independently of block0 data)
 90  FD  11  11  00           - lock permanently

It seems the length byte gets ignored anyway.

Note: it seems some cards only accept the "change UID" command.

It accepts direct read of block0 (and only block0) without prior auth.

Writing to block 0 has some side-effects:

  • It changes also the UID. Changing the UID does not change block 0.
  • ATQA and SAK bytes are automatically replaced by fixed values.
  • On 4-byte UID cards, BCC byte is automatically corrected.

Characteristics

^Top

  • UID: 4b and 7b versions
  • ATQA/SAK: fixed
  • BCC: auto
  • ATS: none

Proxmark3 commands

^Top

# change just UID:
hf mf gen3uid
# write block0:
hf mf gen3blk
# lock (uid/block0?) forever:
hf mf gen3freeze

See also

script run hf_mf_gen3_writer -h

Equivalent:

# change just UID:
hf 14a raw -s -c  -t 2000  90FBCCCC07 11223344556677
# read block0:
hf 14a raw -s -c 3000
# write block0:
hf 14a raw -s -c  -t 2000  90F0CCCC10 041219c3219316984200e32000000000
# lock (uid/block0?) forever:
hf 14a raw -s -c 90FD111100

MIFARE Classic Super

^Top

It behaves like DirectWrite but records reader auth attempts.

To change UID: same commands as for MFC DirectWrite

To do reader-only attack: at least two versions exist.

Identify

^Top

Only type 1 at the moment:

hf 14a info
...
[+] Magic capabilities : super card

MIFARE Ultralight

^Top

MIFARE Ultralight blocks 0..2

^Top

SN0  SN1  SN2  BCC0
SN3  SN4  SN5  SN6
BCC1 Int  LCK0 LCK1

UID is made of SN0..SN6 bytes

Computing BCC0 on UID 04112233445566: analyse lcr -d 88041122 = bf

Computing BCC1 on UID 04112233445566: analyse lcr -d 33445566 = 44

Int is internal, typically 0x48

Anticol shortcut (CL1/3000) is supported for UL, ULC, NTAG except NTAG I2C

MIFARE Ultralight Gen1A

^Top

Identify

TODO

Characteristics

Magic commands

TODO

UID

Only 7b versions

SAK, ATQA, BCC, ATS

TODO need more tests

Proxmark3 commands

^Top

script run hf_mfu_setuid -h

When "soft-bricked" (by writing invalid data in block0), these ones may help:

hf 14a config -h
script run hf_mf_magicrevive -u

MIFARE Ultralight DirectWrite

^Top

Identify

^Top

hf 14a info
...
[+] Magic capabilities : Gen 2 / CUID

It seems so far that all MFUL DW have an ATS.

Magic commands

^Top

Issue three regular MFU write commands in a row to write first three blocks.

Characteristics

^Top

  • UID: Only 7b versions
  • ATQA:
    • all cards play fix ATQA
  • SAK:
    • all cards play fix SAK
  • BCC:
    • some cards play blindly the block0 BCC0 and block2 BCC1 bytes, beware!
    • some cards compute proper BCC0 and BCC1 in anticollision
  • ATS:
    • all cards reply with an ATS

MIFARE Ultralight DirectWrite flavour 1

^Top

  • BCC: computed
  • ATS: 0A78008102DBA0C119402AB5
  • Anticol shortcut (CL1/3000): fails

MIFARE Ultralight DirectWrite flavour 2

^Top

  • BCC: play blindly the block0 BCC0 and block2 BCC1 bytes, beware!
  • ATS: 850000A00A000AB00000000000000000184D
  • Anticol shortcut (CL1/3000): succeeds

Proxmark3 commands

^Top

hf mfu setuid -h

Equivalent: don't use hf mfu wrbl as you need to write three blocks in a row, but do, with proper BCCx:

hf 14a raw -s -c -k a2 00 041122bf 
hf 14a raw    -c -k a2 01 33445566
hf 14a raw    -c    a2 02 44480000

When "soft-bricked" (by writing invalid data in block0), these ones may help:

hf 14a config -h

E.g.:

hf 14a config --atqa force --bcc ignore --cl2 force --cl3 skip --rats skip
hf mfu setuid --uid 04112233445566
hf 14a config --std
hf 14a reader

libnfc commands

^Top

nfc-mfultralight -h

See --uid and --full

Android

^Top

  • MIFARE++ Ultralight

MIFARE Ultralight EV1 DirectWrite

^Top

Similar to MFUL DirectWrite

Identify

^Top

hf 14a info
...
[+] Magic capabilities : Gen 2 / CUID

Characteristics

^Top

  • UID: Only 7b versions
  • ATQA:
    • all cards play fix ATQA
  • SAK:
    • all cards play fix SAK
  • BCC:
    • cards play blindly the block0 BCC0 and block2 BCC1 bytes, beware!
  • ATS:
    • all cards reply with an ATS

MIFARE Ultralight EV1 DirectWrite flavour 1

^Top

  • BCC: play blindly the block0 BCC0 and block2 BCC1 bytes, beware!
  • ATS: 850000A000000AC30004030101000B0341DF

MIFARE Ultralight EV1 DirectWrite flavour 2

^Top

  • BCC: play blindly the block0 BCC0 and block2 BCC1 bytes, beware!
  • ATS: 850000A00A000AC30004030101000B0316D7

MIFARE Ultralight C Gen1A

^Top

Similar to MFUL Gen1A

MIFARE Ultralight C DirectWrite

^Top

Similar to MFUL DirectWrite

Identify

^Top

hf 14a info
...
[+] Magic capabilities : Gen 2 / CUID

Characteristics

^Top

  • UID: Only 7b versions
  • ATQA:
    • all cards play fix ATQA
  • SAK:
    • all cards play fix SAK
  • BCC:
    • cards compute proper BCC0 and BCC1 in anticollision
  • ATS:
    • all cards reply with an ATS

MIFARE Ultralight C DirectWrite flavour 1

^Top

  • BCC: computed
  • ATS: 0A78008102DBA0C119402AB5
  • Anticol shortcut (CL1/3000): fails

NTAG

^Top

NTAG213 DirectWrite

^Top

Similar to MFUL DirectWrite

Identify

^Top

hf 14a info
...
[+] Magic capabilities : Gen 2 / CUID

Characteristics

^Top

  • UID: Only 7b versions
  • ATQA:
    • all cards play fix ATQA
  • SAK:
    • all cards play fix SAK
  • BCC:
    • cards play blindly the block0 BCC0 and block2 BCC1 bytes, beware!
  • ATS:
    • all cards reply with an ATS

NTAG213 DirectWrite flavour 1

^Top

  • BCC: play blindly the block0 BCC0 and block2 BCC1 bytes, beware!
  • ATS: 0A78008102DBA0C119402AB5
  • Anticol shortcut (CL1/3000): succeeds

NTAG21x

^Top

Identify

^Top

hf 14a info
...
[+] Magic capabilities : NTAG21x

Characteristics

^Top

Emulates fully NTAG213, 213F, 215, 216, 216F

Emulates partially UL EV1 48k/128k, NTAG210, NTAG212, NTAGI2C 1K/2K, NTAGI2C 1K/2K PLUS

Anticol shortcut (CL1/3000): fails

Proxmark3 commands

^Top

script run hf_mfu_magicwrite -h

DESFire

^Top

"DESFire" APDU, 7b UID

Identify

TODO

Magic commands

Android compatible

  • issue special APDUs

Characteristics

^Top

  • ATQA: 0344
  • SAK: 20
  • ATS: 0675338102005110 or 06757781028002F0

Only mimics DESFire anticollision (but wrong ATS), no further DESFire support

Proxmark commands

^Top

UID 04112233445566

hf 14a raw -s -c 0200ab00000704112233445566

or equivalently

hf 14a apdu -s 00ab00000704112233445566

libnfc commands

^Top

pn53x-tamashell
4a0100
420200ab00000704112233445566

"DESFire" APDU, 4b UID

^Top

Magic commands

^Top

Android compatible

  • issue special APDUs

Characteristics

^Top

  • ATQA: 0008 ??? This is not DESFire, 0008/20 doesn't match anything
  • SAK: 20
  • ATS: 0675338102005110 or 06757781028002F0

Only mimics DESFire anticollision (but wrong ATS), no further DESFire support

Proxmark commands

^Top

UID 04112233445566

hf 14a raw -s -c 0200ab00000411223344

or equivalently

hf 14a apdu -s 00ab00000411223344

It accepts longer UID but that doesn't affect BCC/ATQA/SAK

pn53x-tamashell commands

^Top

4a0100
420200ab00000411223344

Remarks

^Top

The same effect (with better ATQA!) can be obtained with a MFC Gen1A that uses SAK defined in block0:

hf mf csetblk --blk 0 -d 1122334444204403A1A2A3A4A5A6A7A8
hf 14a info
[+]  UID: 11 22 33 44 
[+] ATQA: 03 44
[+]  SAK: 20 [1]
[+] Possible types:
[+]    MIFARE DESFire MF3ICD40

ISO14443B

^Top

ISO14443B magic

^Top

No such card is available.

Some vendor allow to specify an ID (PUPI) when ordering a card.

ISO15693

^Top

ISO15693 magic

^Top

Identify

TODO

Proxmark3 commands

^Top

Always set a UID starting with E0.

hf 15 csetuid E011223344556677

or (ignore errors):

script run hf_15_magic -u E004013344556677

Multi

^Top

Gen 4 GTU

^Top

A.k.a ultimate magic card, most promenent feature is shadow mode (GTU) and optional password protected backdoor commands.

Can emulate MIFARE Classic, Ultralight/NTAG families, 14b UID & App Data

Identify

^Top ^^Gen4

👉 TODO Tag doesn't get identified correctly by latest Proxmark3 client (it might get mislabeled as MFC Gen2/CUID, Gen3/APDU or NTAG21x Modifiable, depending on configured UID/ATQA/SAK/ATS)

One can identify manually such card if the password is still the default one, with the command to get the current configuration:

hf 14a raw -s -c -t 1000 CF00000000C6

If the card is an Ultimate Magic Card, it returns 30 bytes.

Magic commands

^Top ^^Gen4

Special commands summary:

CF <passwd> 32 <00-03>                           // Configure GTU shadow mode
CF <passwd> 34 <1b length><0-16b ATS>            // Configure ATS
CF <passwd> 35 <2b ATQA><1b SAK>                 // Configure ATQA/SAK (swap ATQA bytes)
CF <passwd> 68 <00-02>                           // Configure UID length
CF <passwd> 69 <00-01>                           // (De)Activate Ultralight mode
CF <passwd> 6A <00-03>                           // Select Ultralight mode
CF <passwd> C6                                   // Dump configuration
CF <passwd> CC                                   // Factory test, returns 6666
CF <passwd> CD <1b block number><16b block data> // Backdoor write 16b block
CF <passwd> CE <1b block number>                 // Backdoor read 16b block
CF <passwd> F0 <30b configuration data>          // Configure all params in one cmd
CF <passwd> F1 <30b configuration data>          // Configure all params in one cmd and fuse the configuration permanently
CF <passwd> FE <4b new_password>                 // change password

Default <passwd>: 00000000

Characteristics

^Top ^^Gen4

  • UID: 4b, 7b and 10b versions
  • ATQA/SAK: changeable
  • BCC: auto
  • ATS: changeable, can be disabled
  • Card Type: changeable
  • Shadow mode: GTU
  • Backdoor password mode

Proxmark3 commands

^Top ^^Gen4

# view contents of tag memory:
hf mf gview

👉 TODO hf mf gview is currently missing Ultralight memory maps

Equivalent:

hf 14a raw -s -c -t 1000 CF00000000CE00
hf 14a raw -s -c -t 1000 CF00000000CE01
hf 14a raw -s -c -t 1000 CF00000000CE02
...

Change ATQA / SAK

^Top ^^Gen4

hf 14a raw -s -c -t 1000 CF<passwd>35<2b ATQA><1b SAK>
  • ⚠ ATQA bytes are swapped in the command
  • ⚠ when SAK bit 6 is set (e.g. SAK=20 or 28), ATS must be turned on, otherwise the card may not be recognized by some readers!
  • ⚠ never set SAK bit 3 (e.g. SAK=04), it indicates an extra cascade level is required (see hf 14a config --cl2 skip or hf 14a config --cl3 skip to recover a misconfigured card)

Example: ATQA 0044 SAK 28, default pwd

hf 14a raw -s -c -t 1000 CF0000000035440028

Change ATS

^Top ^^Gen4

hf 14a raw -s -c -t 1000 CF<passwd>34<1b length><0-16b ATS>
  • <length>: ATS length byte, set to 00 to disable ATS
  • ⚠ when SAK bit 6 is set (e.g. SAK=20 or 28), ATS must be turned on, otherwise the card may not be recognized by some readers!
  • ATS CRC will be added automatically, don't configure it
  • Max ATS length: 16 bytes (+CRC)

Example: ATS to 0606757781028002F0, default pwd

hf 14a raw -s -c -t 1000 CF000000003406067577810280

Set UID length (4, 7, 10)

^Top ^^Gen4

hf 14a raw -s -c -t 1000 CF<passwd>68<1b param>
  • <param>
    • 00: 4 bytes
    • 01: 7 bytes
    • 02: 10 bytes

Example: set UID length to 7 bytes, default pwd

hf 14a raw -s -c -t 1000 CF000000006801

Set 14443A UID

^Top ^^Gen4

UID is configured according to block0 with a backdoor write.

Example: preparing first two blocks:

hf 14a raw -s -c -t 1000 CF00000000CD00000102030405060708090A0B0C0D0E0F
hf 14a raw -s -c -t 1000 CF00000000CD01101112131415161718191A1B1C1D1E1F
hf 14a reader

MFC mode, 4b UID
=> UID 00010203

MFC mode, 7b UID
=> UID 00010203040506

MFC mode, 10b UID
=> UID 00010203040506070809

Ultralight mode, 4b UID
=> UID 00010203

Ultralight mode, 7b UID
=> UID 00010210111213
👉 the UID is composed of first two blocks as in regular Ultralights

Ultralight mode, 10b UID
=> UID 00010203040506070809
👉 the UID is composed only from block0

Set 14443B UID and ATQB

^Top ^^Gen4

UID and ATQB are configured according to block0 with a (14a) backdoor write.

UID size is always 4 bytes.

Example:

hf 14a raw -s -c -t 1000 CF00000000CD00000102030405060708090A0B0C0D0E0F
hf 14b reader

=> UID 00010203
=> ATQB 0405060708090A

(De)Activate Ultralight mode

^Top ^^Gen4

hf 14a raw -s -c -t 1000 CF<passwd>69<1b param>
  • <param>
    • 00: MIFARE Classic mode
    • 01: MIFARE Ultralight/NTAG mode

Example: activate Ultralight protocol, default pwd

hf 14a raw -s -c -t 1000 CF000000006901

In this mode, if SAK=00 and ATQA=0044, it acts as an Ultralight card

⚠ only the first four bytes of each block will be mapped in the Ultralight memory map (so the Ultralight block numbers follow backdoor R/W block numbers).

Select Ultralight mode

^Top ^^Gen4

hf 14a raw -s -c -t 1000 CF<passwd>6A<1b param>
  • <param>
    • 00: UL EV1
    • 01: NTAG
    • 02: UL-C
    • 03: UL

⚠ it supposes Ultralight mode was activated (cf command 69)

Example: set Ultralight mode to Ultralight-C, default pwd

hf 14a raw -s -c -t 1000 CF000000006A02

Now the card supports the 3DES UL-C authentication.

Set shadow mode (GTU)

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This mode is divided into four states: off (pre-write), on (on restore), don’t care, and high-speed read and write. If you use it, please enter the pre-write mode first. At this time, write the full card data. After writing, set it to on. At this time, after writing the data, the first time you read the data just written, the next time you read It is the pre-written data. All modes support this operation. It should be noted that using any block to read and write in this mode may give wrong results.

hf 14a raw -s -c -t 1000 CF<passwd>32<1b param>
  • <param>
    • 00: pre-write, shadow data can be written
    • 01: restore mode
    • 02: disabled
    • 03: disabled, high speed R/W mode for Ultralight?

Direct block read and write

^Top ^^Gen4

Using the backdoor command, one can read and write any area without MFC password, similarly to MFC Gen1 card. It should be noted that this command must be used to modify UID.

Backdoor read 16b block:

hf 14a raw -s -c -t 1000 CF<passwd>CE<1b block number>

Backdoor write 16b block:

hf 14a raw -s -c -t 1000 CF<passwd>CD<1b block number><16b block data>

Read/Write operations work on 16 bytes, no matter the Ultralight mode.

Note that only the first four bytes of each block will be mapped in the Ultralight memory map.

Example: read block0, default pwd

hf 14a raw -s -c -t 1000 CF00000000CE00

Example: write block0 with factory data, default pwd

hf 14a raw -s -c -t 1000 CF00000000CD00112233441C000011778185BA18000000

Change backdoor password

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All backdoor operations are protected by a password. If password is forgotten, the card can't be recovered. Default password is 00000000.

Change password:

hf 14a raw -s -c -t 1000 CF <passwd> FE <4b new_password>

Example: change password from 00000000 to AABBCCDD

hf 14a raw -s -c -t 1000 CF00000000FEAABBCCDD

Example: change password from AABBCCDD back to 00000000

hf 14a raw -s -c -t 1000 CFAABBCCDDFE00000000

Dump configuration

^Top ^^Gen4

hf 14a raw -s -c -t 1000 CF<passwd>C6

Default configuration:

00000000000002000978009102DABC191010111213141516040008004F6B
                                                        ^^^^ ??
                                                      ^^ cf cmd 6a: UL mode
                                                ^^^^^^ cf cmd 35: ATQA/SAK
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cf cmd 34: ATS length & content
            ^^ cf cmd 32: GTU mode
    ^^^^^^^^ cf cmd fe: password
  ^^ cf cmd 68: UID length
^^ cf cmd 69: Ultralight protocol

Fast configuration

^Top ^^Gen4

hf 14a raw -s -c -t 1000 CF<passwd>F0<30b configuration data>

cf Dump configuration for configuration data description.

Example: Write factory configuration, using default password

hf 14a raw -s -c -t 1000 CF00000000F000000000000002000978009102DABC191010111213141516040008004F6B

⚠ Variant with command F1 instead of F0 will set and fuse permanently the configuration. Backdoor R/W will still work.

Presets

^Top ^^Gen4

Here are some presets available in the FuseTool (but with all ATS disabled)

MIFARE Mini S20 4-byte UID

hf 14a raw -s -c -t 1000 CF00000000F000000000000002000978009102DABC19101011121314151604000900

MIFARE Mini S20 7-byte UID

hf 14a raw -s -c -t 1000 CF00000000F000010000000002000978009102DABC19101011121314151644000900

MIFARE 1k S50 4-byte UID (this is the factory setting)

hf 14a raw -s -c -t 1000 CF00000000F000000000000002000978009102DABC19101011121314151604000800

MIFARE 1k S50 7-byte UID

hf 14a raw -s -c -t 1000 CF00000000F000010000000002000978009102DABC19101011121314151644000800

MIFARE 4k S70 4-byte UID

hf 14a raw -s -c -t 1000 CF00000000F000000000000002000978009102DABC19101011121314151602001800

MIFARE 4k S70 7 byte UID

hf 14a raw -s -c -t 1000 CF00000000F000010000000002000978009102DABC19101011121314151642001800

Ultralight

hf 14a raw -s -c -t 1000 CF00000000F001010000000003000978009102DABC19101011121314151644000003

Ultralight-C

hf 14a raw -s -c -t 1000 CF00000000F001010000000003000978009102DABC19101011121314151644000002

Ultralight EV1

hf 14a raw -s -c -t 1000 CF00000000F001010000000003000978009102DABC19101011121314151644000000

NTAG21x

hf 14a raw -s -c -t 1000 CF00000000F001010000000003000978009102DABC19101011121314151644000001

Version and Signature

^Top ^^Gen4

Ultralight EV1 and NTAG Version info and Signature are stored respectively in blocks 250-251 and 242-249.

Example for an Ultralight EV1 128b with the signature sample from tools/recover_pk.py

hf 14a raw -s -c -t 1000 CF00000000F001010000000003000978009102DABC19101011121314151644000000
hf mfu wrbl -b 0 -d 04C12865
hf mfu wrbl -b 1 -d 5A373080
hf mfu wrbl -b 242 -d CEA2EB0B --force
hf mfu wrbl -b 243 -d 3C95D084 --force
hf mfu wrbl -b 244 -d 4A95B824 --force
hf mfu wrbl -b 245 -d A7553703 --force
hf mfu wrbl -b 246 -d B3702378 --force
hf mfu wrbl -b 247 -d 033BF098 --force
hf mfu wrbl -b 248 -d 7899DB70 --force
hf mfu wrbl -b 249 -d 151A19E7 --force
hf mfu wrbl -b 250 -d 00040301 --force
hf mfu wrbl -b 251 -d 01000E03 --force
hf mfu info

Example for an NTAG216 with the signature sample from tools/recover_pk.py

hf 14a raw -s -c -t 1000 CF00000000F001010000000003000978009102DABC19101011121314151644000001
hf mfu wrbl -b 0 -d 04E10C61
hf mfu wrbl -b 1 -d DA993C80
hf mfu wrbl -b 242 -d 8B76052E --force
hf mfu wrbl -b 243 -d E42F5567 --force
hf mfu wrbl -b 244 -d BEB53238 --force
hf mfu wrbl -b 245 -d B3E3F995 --force
hf mfu wrbl -b 246 -d 0707C0DC --force
hf mfu wrbl -b 247 -d C956B5C5 --force
hf mfu wrbl -b 248 -d EFCFDB70 --force
hf mfu wrbl -b 249 -d 9B2D82B3 --force
hf mfu wrbl -b 250 -d 00040402 --force
hf mfu wrbl -b 251 -d 01001303 --force
hf mfu info