DESFire EV1 2K3DES change Password CRC32 Error

[Damian Makuch]

Hello,
I have a problem with change password on DESFire EV1 card.
My step:
1 Create Application, 0x000001 -> OK
2 Create STD File 0x01 Key sett 0x00 size 0x10 -> OK
3 Create STD File 0x02 Key sett 0x00 size 0x10 -> OK
4 Authentacation to application 0x000001 (Standard Mode) via key nr 0x00 (Pass = 0x00000000000000000000000000000000) Ok
5 Change Key nr 0x00 -> CRC32 error (AN0945 9.1.2.2 Case 2, TDES Standard 16-Byte Key)

After Authentication i can normal read file and all is ok but can't change password 0x00...
To change Key i Use Session Key form RandA RandB 16Byte Page 36 on AN0945 5.3.1

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[Damian Makuch]

Problem Solved...
K1 = K2 = K3... 8Byte Key no 16Byte :)

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[TapLinx Support]

Hi Damian,

Please take in mind the rules for “Triple DES”:
If K1 = K2 = K3, it is simple DES and therefore TapLinx generates an error if both key halves are the same for 2K3DES keys.

The TapLinx team

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