HID Global Corporation 5553 Manual Do Utilizador

HF Multi ISO RFID Reader User Manual, Firmware V1.4

1508-USM-00-0-04

my-d™ secure key

For more detailed information on key information data refer to Infineon documentation.

DES key option byte

Bit

Description

0 … 16 byte key
1 … 8 byte key

1 – 7

RFU

In case of an 8-byte key, the first 8 bytes of the key data are valid.

MIFARE key

Only the first 6 bytes of key data are valid.

Number of stored keys

The key management is able to store up to 32 keys.

Encryption

Key Data for DESFire and MIFARE keys has to be encrypted with the login key in CBC mode.
my-d™ S keys are enciphered every 8 byte block separately without CBC mode.

CBC mode

The data stream has to be divided into blocks of 8 bytes. The last enciphered block has to be
XORed with the next plain block.

Enc

Enc(block2)

block2

XOR

Enc(block1)

August 2010

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