AT88RF04C-WA1 Atmel, AT88RF04C-WA1 Datasheet - Page 112

• Manufacturer Part Number: AT88RF04C-WA1
• Manufacturer: Atmel

Specifications of AT88RF04C-WA1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

J.8.
112
Table 90.
Authentication Activation
Authentication Communication Security is activated using the following Mutual Authentication procedure.
1.
2.
3.
4.
5.
6.
7.
The Secret Seed G
are written (by the PICC) each time a Verify Crypto command is received by the PICC. The S
PICC) each time the Mutual Authentication procedure succeeds.
If the Host receives a NACK response from the PICC, then the Mutual Authentication procedure can be retried starting
with step 2.
Figure 35 shows the Mutual Authentication procedure as a flowchart.
AT88SC0808/1616/3216/6416CRF, AT88RF04C
The Host reads the PICC ID from Nc (or another equivalent memory location) and calculates the diversified key
matching the PICC Secret Seed G. G = F1(K, ID, x, y, z)
The Host reads AAC
The Host generates a Random Number Q
cryptographic engine: [CH
The Host Sends Verify Crypto Command with Key Index $0i: Verify Crypto ($0i, Q
The PICC calculates challenge CH and other parameters using Q
[CH, C
The PICC compares the internally calculated challenge CH to the value received from the host. If CH = CH
the host is authenticated and the card writes the calculated values of C
The AAC
to the host.
The Host reads the new AAC
3. If C
AAC Register
A
$AA
$5A
$6A
$9A
$A5
$A6
$A9
$55
$56
$59
$65
$66
$69
$95
$96
$99
i
A
= C
, S
All Other Values Are Not Supported
Authentication Attempt Counter Coding for 88RF PICCs.
i
is cleared, Authentication Communication Security mode is activated, and an ACK response is returned
i
A
i
A
] = F2(G
then the card is authenticated. The Mutual Authentication procedure is complete.
i
value in the PICC never changes after it is locked at personalization. The AAC
i
i
, C
and C
i
, Q
15 Failed Attempts (LOCK)
A
A
i
, C
)
from card.
i
No Failed Attempts
10 Failed Attempts
11 Failed Attempts
12 Failed Attempts
13 Failed Attempts
14 Failed Attempts
2 Failed Attempts
3 Failed Attempts
4 Failed Attempts
5 Failed Attempts
6 Failed Attempts
7 Failed Attempts
8 Failed Attempts
9 Failed Attempts
and C
A
1 Failed Attempt
, S
Description
A
] = F2(G, C, Q
i
A
from C
A
and calculates challenge CH
i
register of the PICC and compares it to the calculated C
A
)
A
from the host with the cryptographic engine:
i
A
A
to the C
and other parameters with the
i
register and S
A
, CH
A
)
i
register is written (by the
i
A
i
, and C
to the Si register.
5276C–RFID–3/09
A
from step
i
registers
A
then