AT88SC0104CA-PU Atmel, AT88SC0104CA-PU Datasheet - Page 39
![IC EEPROM 1KBIT 4MHZ 8DIP](/photos/6/50/65033/313-8-dip_sml.jpg)
AT88SC0104CA-PU
Manufacturer Part Number
AT88SC0104CA-PU
Description
IC EEPROM 1KBIT 4MHZ 8DIP
Manufacturer
Atmel
Series
CryptoMemory®r
Specifications of AT88SC0104CA-PU
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
-40°C ~ 85°C
Package / Case
8-DIP (0.300", 7.62mm)
For Use With
AT88SC-SDK1 - KIT TUEMA DK CRYPTOMEM SMARTCARDAT88SC-DK1 - KIT DEV FOR AT88SCXXXXC FAMILY
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
38
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 decrements 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 attempts counter accordingly.
Key index:
Data:
Figure 26. Verify CRYPTO
Once the sequence has been carried out, the device requires the host to perform an ACK polling with either the Read
User Zone $B2 command or System READ $B6 command. To verify whether the authentication succeeded, the host
could either read the associated attempts counter to confirm the value is $FF, or read the post authentication
cryptogram from the device and compare with the cryptogram generated when the host computed the challenge bytes.
Atmel AT88SC0104/0204/0404/0808/CA
R
S
T
A
T
Command
b0000_00nn : Secret Seed G
b0001_00nn : Session Encryption Key S
Q : Host random number, 8 bytes
CH : Host challenge, 8 bytes
1011 1000
C
A
K
Key Index
000e 00nn
0
A
C
K
-G
3
Parameter 2
xxxx xxxx
0
-S
3
C
A
K
0001 0000
N=16
i
, and Secret Seed, G
A
C
K
Data x 16
d7--- ---d0
i
(or Session Encryption Key, S
A
C
K
i
S
O
P
T
and S
i
. The device utilizes the
8664C–CRYPT–01/10
i
). The