Quickcool Radio modules KEYFOB-MF1K-02PVC-WHEP Data Sheet

MF1S50YYX

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© NXP B.V. 2011. All rights reserved.

After authentication any of the following operations may be performed:

Read block

Write block

Decrement: Decrements the contents of a block and stores the result in an internal 
data-register

Increment: Increments the contents of a block and stores the result in an internal 
data-register

Restore: Moves the contents of a block into an internal data-register

Transfer: Writes the contents of the temporary internal data-register to a value block

Following mechanisms are implemented in the contactless communication link between 
reader and card to ensure very reliable data transmission:

16 bits CRC per block

Parity bits for each byte

Bit count checking

Bit coding to distinguish between “1”, “0” and “no information”

Channel monitoring (protocol sequence and bit stream analysis)

1. The reader specifies the sector to be accessed and chooses key A or B.

2. The card reads the secret key and the access conditions from the sector trailer. Then 

the card sends a number as the challenge to the reader (pass one).

3. The reader calculates the response using the secret key and additional input. The 

response, together with a random challenge from the reader, is then transmitted to the 
card (pass two).

4. The card verifies the response of the reader by comparing it with its own challenge 

and then it calculates the response to the challenge and transmits it (pass three).

5. The reader verifies the response of the card by comparing it to its own challenge.

After transmission of the first random challenge the communication between card and 
reader is encrypted.