AT88SC3216CRF-MVB1G Atmel, AT88SC3216CRF-MVB1G Datasheet - Page 114

• Manufacturer Part Number: AT88SC3216CRF-MVB1G
• Description: CRYPTOMEMORY 32KBIT 16ZONE MVB
• Manufacturer: Atmel
• Series: CryptoMemory®, CryptoRF®r

Specifications of AT88SC3216CRF-MVB1G

• Rf Type: Read / Write
• Frequency: 13.56MHz
• Features: ISO1444-2, 1444-3, 32-kbits
• Package / Case: MVB Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

J.8.1. Key Index
J.9.
J.10.
J.11.
114
The Key Index byte of the Verify Crypto command selects the Key Set that the PICC uses to perform the Mutual
Authentication procedure.
Table 91.
Set User Zone and Checksums
The Mutual Authentication procedure can be performed before or after the Set User Zone command is sent. It is not
necessary to repeat the Mutual Authentication procedure when changing User Zones unless the new User Zone
requires a different Key Set. If Authentication Communication Security is activated and the application later selects a
User Zone that does not require Authentication, the PICC will remain in Authentication Communication Security mode
and all of the Authentication mode requirements will continue to apply.
When Authentication Communication Security is active the Host must supply a correct cryptographic checksum when
writing data to a User Zone. This is true even if the User Zone Access Register does not require Authentication for
access to the zone.
Passwords
When Authentication Communication Security is active Passwords are encrypted during communications. The Host is
required to encrypt the three password bytes when sending the Check Password command. The PICC encrypts any
password bytes that are accessed with the Read System Zone command. The Host is required to encrypt any
password bytes when sending the Write System Zone command.
Deactivating Authentication Communication Security
Once activated, the PICC will remain in Authentication Communication Security mode until a security error occurs, a
new Verify Crypto command is received, RF power is removed, or a DESELECT command or IDLE command is
received.
In some applications it is necessary to deactivate Authentication Communication Security so that data can be written to
a User Zone that has open read/write access without the necessity of computing a cryptographic checksum. While
there are several possible ways to reset the cryptographic engine and exit the Authentication Communication Security
mode, it is recommended that the Send Checksum command be used for this purpose.
If the PICC receives a Send Checksum command containing an incorrect checksum, the PICC resets the cryptographic
engine, returns to Normal Communication mode, and returns a NACK response to the host. The AAC
incremented by the PICC when a bad checksum is received, so there is no penalty for using Send Checksum to exit
Authentication mode.
AT88SC0808/1616/3216/6416CRF, AT88RF04C
Key Index
$00
$01
$02
$03
Key Index coding for the Verify Crypto command for Mutual Authentication
Secret Seed G
Secret Seed G
Secret Seed G
Secret Seed G
0
1
2
3
Key
i
register is not
5276C–RFID–3/09