AT88SC0104CA-MJTG Atmel, AT88SC0104CA-MJTG Datasheet - Page 53
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AT88SC0104CA-MJTG
Manufacturer Part Number
AT88SC0104CA-MJTG
Description
CRYPTOMEM 1KBIT 4 ZONE MOD J TWI
Manufacturer
Atmel
Series
CryptoMemory®r
Specifications of AT88SC0104CA-MJTG
Format - Memory
EEPROMs - Serial
Memory Type
EEPROM
Memory Size
1K (128 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
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