AT88SC0404CA-MJTG Atmel, AT88SC0404CA-MJTG Datasheet - Page 53

• Manufacturer Part Number: AT88SC0404CA-MJTG
• Description: CRYPTOMEM 4KBIT 4 ZONE MOD J TWI
• Manufacturer: Atmel
• Series: CryptoMemory®r

Specifications of AT88SC0404CA-MJTG

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 4K (512 x 8)
• Speed: 4MHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: M2 J, Smart Card Module
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.9. Verify CRYPTO: $B8
10.9.1. Functional
52
Figure 34. Verify CRYPTO Command Functional Description
When the device receives the Verify CRYPTO command, it computes a challenge based on the received random
number, Q, the internally stored associated Cryptogram, C
device also increments the associated attempts counter. It then compares the computed challenge with the challenge
sent by the host. If the challenges match, the device computes and writes a new C
success or failure information of the authentication process and updates the authentication attempts counter
accordingly.
Key index:
Data :
Atmel AT88SC0104/0204/0404/0808/CA
8-random bytes
8-challenge bytes
b0000_00nn : Secret Seed G
b0001_00nn : Session Encryption Key S
Q : Host random number, 8-bytes
CH : Host challenge, 8-bytes
Command
Key Index
Host
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
0
-G
3
0
-S
3
Device
i,
and Secret Seed, G
i
(or Session Encryption Key, S
i
and S
i
. The device utilizes the
8664C–CRYPT–01/10
i
). The