MF1S5009DA4 datasheet(9/32 Pages) NXP

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MF1S5009

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Product data sheet

PUBLIC

Rev. 3 — 27 July 2010

189131

9 of 32

NXP Semiconductors

MF1S5009

Mainstream contactless smart card IC

9.2.5 Memory operations

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 a temporary

internal data-register

• Increment: Increments the contents of a block and stores the result in the

data-register

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

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

9.3 Data integrity

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)

9.4 Three pass authentication sequence

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 random 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.

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